Registration Dossier
Registration Dossier
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EC number: 295-463-0 | CAS number: 92045-80-2 A complex combination of hydrocarbons obtained by subjecting a liquified petroleum gas mix to a sweetening process to oxidize mercaptans or to remove acidic impurities. It consists predominantly of C4 saturated and unsaturated hydrocarbons.
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: But-1-ene CAS number: 106-98-9 SMILES structure:C(=C)CC - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 14.882 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 4.035 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 14.882 and 4.035 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of But-1-ene for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 14.882 mg/L and 4.035 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: But-2-ene, trans- CAS number: 624-64-6 SMILES structure: C(=CC)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 16.868 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 4.501 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 16.868 and 4.501 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of But-2-ene, trans- for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 16.868 mg/L and 4.501 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Buta-1,3-diene CAS number:106-99-0 SMILES structure:C(C=C)=C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 17.832 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 4.702 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 17.832 and 4.702 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Buta-1,3-diene for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 17.832 mg/L and 4.702 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Butane CAS number: 106-97-8 SMILES structure: C(CC)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 12.405 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 3.459 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 12.405 and 3.459 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Butane for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 12.405 mg/L and 3.459 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Carbon Monoxide CAS number: 630-08-0 SMILES structure: O1=C=1 - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 124.406 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 23.452 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 124.406 and 23.452 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Carbon Monoxide for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 124.406 mg/L and 23.452 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Ethane CAS number: 74-84-0 SMILES structure: CC - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 30.707 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 6.997 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 30.707 and 6.997 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Ethane for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 30.707 mg/L and 6.997 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Ethene [aka Ethylene] CAS number: 74-85-1 SMILES structure: C=C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 31.413 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 7.074 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 31.413 and 7.074 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Ethene [aka Ethylene] for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 31.413 mg/L and 7.074 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Pentane CAS number: 109-66-0 SMILES structure: C(CCC)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 7.039 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 2.172 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 7.039 and 2.172 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Pentane for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 7.039 mg/L and 2.172 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Prop-1-ene CAS number: 115-07-1 SMILES structure: C(=C)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 24.416 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 5.985 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 24.416 and 5.985 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Prop-1-ene for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 24.416 mg/L and 5.985 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Prop-1-ene, 2-methyl- CAS number: 115-11-7 SMILES structure: C(=C)(C)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 13.607 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 3.733 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 13.607 and 3.733 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Prop-1-ene, 2-methyl- for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 13.607 mg/L and 3.733 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Propane CAS number: 74-98-6 SMILES structure: C(C)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 20.586 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 5.19 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 20.586 and 5.190 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Propane for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 20.586 mg/L and 5.190 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Propane, 2-methyl- CAS number: 75-28-5 SMILES structure: C(C)(C)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 13.946 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 3.831 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 13.946 and 3.831 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of Propane, 2-methyl- for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 13.946 mg/L and 3.831 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance:But-2-ene, cis- CAS number:590-18-1 SMILES structure:C(=CC)C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 16.868 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 4.501 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2).
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 16.868 and 4.501 mg/L, respectively.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of But-2-ene, cis- for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 16.868 mg/L and 4.501 mg/L, respectively.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: QSAR calculation, reliable with restrictions
- Justification for type of information:
- Measured data are not available for this substance and endpoint. Due to the practical difficulties associated with the ecotoxicity testing of this substance, the use of QSAR toxicity estimates is an appropriate alternative. The ECOSAR model is a reliable and appropriate QSAR model to apply to this substance as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis. The endpoint calculated here is therefore a reasonable estimate of its baseline toxicity.
- Principles of method if other than guideline:
- The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
- GLP compliance:
- no
- Specific details on test material used for the study:
- Program: ECOSAR v.1.11 (Epi Suite 4.1)
Substance: Methane CAS number: 74-82-8 SMILES structure: C - Analytical monitoring:
- no
- Details on sampling:
- not applicable
- Vehicle:
- no
- Details on test solutions:
- not applicable
- Test organisms (species):
- other: green algae
- Details on test organisms:
- not applicable
- Test type:
- not specified
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 96 h
- Post exposure observation period:
- not applicable
- Hardness:
- not applicable
- Test temperature:
- not applicable
- pH:
- not applicable
- Dissolved oxygen:
- not applicable
- Salinity:
- not applicable
- Nominal and measured concentrations:
- not applicable
- Details on test conditions:
- not applicable
- Reference substance (positive control):
- no
- Duration:
- 96 h
- Dose descriptor:
- EC50
- Effect conc.:
- 39.195 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- growth rate
- Remarks on result:
- other: QSAR prediction value
- Duration:
- 96 h
- Dose descriptor:
- other: ChV
- Effect conc.:
- 7.981 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- other: QSAR prediction
- Basis for effect:
- not specified
- Remarks on result:
- other: QSAR prediction value
- Details on results:
- Methane is not soluble enough to measure the predicted short-term effect.
The ChV, or Chronic Value, is defined as the geometric mean of the no observed effect concentration (NOEC) and the lowest observed effect concentration (LOEC). This can be mathematically represented as: ChV = 10^([log (LOEC x NOEC)]/2). - Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Calculated value
- Conclusions:
- The predicted 96-hour EC50 and ChV for this constituent for green algae were 39.195 and 7.981 mg/L, respectively. However, methane is not soluble enough to measure the predicted short-term effect.
- Executive summary:
The ECOSAR model was used as a reliable and appropriate QSAR model to predict the baseline toxicity of the Methane for green algae. The 96 -hour EC50 and ChV for green algae were predicted to be 39.195 mg/L and 7.981 mg/L, respectively. However, methane is not soluble enough to measure the predicted short-term effect.
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP compliant, guideline study, available as unpublished reported, no restrictions fully adequate for assessment
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Alga, Growth Inhibition Test)
- GLP compliance:
- yes
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material :
not applicable - Analytical monitoring:
- yes
- Details on sampling:
- Samples were taken daily through a septum in the test vessel. Samples from each test concentration were pooled.
- Vehicle:
- no
- Details on test solutions:
- Benzene was added directly to algal medium to form a stock solution. This was then diluted serially to produce the desired test concentrations.
- Test organisms (species):
- Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
- Details on test organisms:
- ATCC 22662. Algae were taken from a preculture in log phase growth.
- Test type:
- static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 72 h
- Post exposure observation period:
- none
- Hardness:
- 24.2mg/L equivalent to CaCO3
- Test temperature:
- 23±2°C
- pH:
- 7 at start of test, 7-8.8 at end of test
- Dissolved oxygen:
- not measured
- Salinity:
- not applicable
- Nominal and measured concentrations:
- 1.3, 4.3, 13, 43 and 134mg/L nominal. Measured concentrations remained between 83-100% of initial measurements throughout test. Results are reported as initial measured concentrations: 0.7, 2.6, 8.0, 27 and 98mg/L.
- Details on test conditions:
- Standard growth medium used, but 300mg/L NaHCO3 not 50mg/L as specified in OECD 201. Test vessels were 40ml cylindrical glass vials. An initial cell density of 1.40E+03 cells/ml and a control end cells density of 5.50E+05 cells/ml. Cell concentrations determined with an Electronic particle counter (Coulter Multisizer Iie). Five replicates per test concentration and sampling point (after sampling vessels were discarded) kept under continuous illumination at a light intensity of 60-120µmol/m2/sec.
- Reference substance (positive control):
- no
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 32 mg/L
- Nominal / measured:
- meas. (not specified)
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 100 mg/L
- Nominal / measured:
- meas. (not specified)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 10 mg/L
- Nominal / measured:
- meas. (not specified)
- Conc. based on:
- test mat.
- Basis for effect:
- biomass
- Duration:
- 72 h
- Dose descriptor:
- EC10
- Effect conc.:
- 34 mg/L
- Nominal / measured:
- meas. (not specified)
- Conc. based on:
- test mat.
- Basis for effect:
- growth rate
- Details on results:
- Effect values based on measured concentrations.
- Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- data not reported
- Validity criteria fulfilled:
- not specified
- Conclusions:
- The 72 hour EC50 is 100mg/L and the 72 hour EC10 is 34mg/L
- Executive summary:
This study followed a standard guideline and was conducted to GLP. A closed system was used due to the volatility of the test substance, so reduced starting cell numbers were used and pH adjusted. This is therefore suitable for use as the key study and was used as the key study for this endpoint in the EU RAR for benzene (2002).
Referenceopen allclose all
Description of key information
The members of this category are gases at standard temperature and pressure and will predominantly partition to the atmosphere, what will limit their aquatic toxicity. Consequently, conducting aquatic ecotoxicity tests is technically difficult and based on exposure estimates the test may not be relevant. In addition, it is difficult to assess the toxicity of UVCB streams using standard test methods. Instead, it is more appropriate to consider the toxicity of representative constituents of these streams.
Due to the difficulty associated with conducting aquatic toxicity tests, experimental data is available only for a members of this category: Benzene (CAS 71-43-2). The 72-hour EC50 and EC10 for benzene for Pseudokirchneriella subcapitata were 100 mg/L and 34 mg/L, respectively.
For the other members of this category, the use of QSAR to predict the ecotoxicity of representative constituents is an appropriate technique for aquatic toxicity. ECOSAR v.1.11 (Epi Suite 4.1) has been used as key QSAR. The representative constituents of the category studied and used as supporting read-across are But-1-ene (CAS 106-98-9), But-2-ene, cis- (CAS 590-18-1), But-2-ene, trans- (CAS 624-64-6), Buta-1,3-diene (CAS 106-99-0), Butane (CAS 106-97-8), Carbon Monoxide (CAS 630-08-0), Ethane (CAS 74-84-0), Ethene [aka Ethylene] (CAS 74-85-1), Methane (CAS 74-82-8), Pentane (CAS 109-66-0), Prop-1-ene (CAS 115-07-1), Prop-1-ene, 2-methyl- (CAS 115-11-7), Propane (CAS 74-98-6), Propane, 2-methyl- (CAS 75-28-5). The model predicted EC50 for short-term toxicity to aquatic algae and cyanobacteria to range from 7.04 mg/L to 124 mg/L, whereas the chronic value for long-term toxicity to aquatic algae and cyanobacteria was predicted to range from 2.17 mg/L to 23.5 mg/L.
Key value for chemical safety assessment
Additional information
Experimental data
An algal study is available which report results after 72 hours exposure. The study used Pseudokirchneriella subcapitata in standard OECD 201 studies using closed systems and the effect values are based on measured concentrations. Following the same approach as set out in the EU RAR (2008), as Galassi et al., (1988) only derive an EC50 value with no information available on the no effect level, the results found by TNO (2001) will be used for the further effects assessment.
QSAR data
The ECOSAR class program has been developed primarily for the evaluation of neutral organic compounds and organic classes with excess toxicity. The QSARs in the ECOSAR program are developed for chemical classes based on measured test data that have been submitted by industry or they are developed by other sources for chemicals with similar structures, e.g., phenols. Using the measured aquatic toxicity values and estimated Kow values, regression equations can be developed for a class of chemicals. Toxicity values for new chemicals may then be calculated by inserting the Kow value into the regression equation and correcting the resultant value for the molecular weight of the compound.
The predicted values were:
Constituent Name | CAS number | EC50 Algae (mg/L) | ChV Algae (mg/L) |
But-1-ene | 106-98-9 | 14.88 | 4.04 |
But-2-ene, cis- | 590-18-1 | 16.87 | 4.50 |
But-2-ene, trans- | 624-64-6 | 16.87 | 4.50 |
Buta-1,3-diene | 106-99-0 | 17.83 | 4.70 |
Butane | 106-97-8 | 12.41 | 3.46 |
Carbon Monoxide | 630-08-0 | 124.41 | 23.45 |
Ethane | 74-84-0 | 30.71 | 7.00 |
Ethene [aka Ethylene] | 74-85-1 | 31.41 | 7.07 |
Methane | 74-82-8 | 39.20* | 7.98 |
Pentane | 109-66-0 | 7.04 | 2.17 |
Prop-1-ene | 115-07-1 | 24.42 | 5.99 |
Prop-1-ene, 2-methyl- | 115-11-7 | 13.61 | 3.73 |
Propane | 74-98-6 | 20.59 | 5.19 |
Propane, 2-methyl- | 75-28-5 | 13.95 | 3.83 |
*Methane is not soluble enough to measure this predicted short-term effect.
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