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EC number: 281-897-8 | CAS number: 84057-80-7
- 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
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
- Endpoint:
- bioaccumulation in aquatic species: algae / cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Sorption/uptake - desorption study with various microalgae and cyanobacteria.
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
Zirconium dichloride oxide was used as test substance. Nevertheless, when put in water, zirconium dichloride oxide hydrolyses rapidly and precipitates as zirconium dioxide. Therefore, zirconium dioxide is actually the substance being tested in this study. - Radiolabelling:
- no
- Test organisms (species):
- Chlorella emersonii
- Details on test organisms:
- For the bioaccumulation test, algae in the exponential phase of growth were centrifuged. The supernatant was removed and the cells washed once with 10 mM sodium acetate buffer, pH 5.0. Cells were centrifuged and resuspended in 10 mM sodium acetate buffer, pH 5.0 to cell densities of 5 x 10 6 mL-1.
- Route of exposure:
- aqueous
- Test type:
- not specified
- Water / sediment media type:
- natural water: freshwater
- Total exposure / uptake duration:
- 4 h
- Total depuration duration:
- 24 h
- Hardness:
- No information available
- Test temperature:
- 23°C
- pH:
- 5
- Dissolved oxygen:
- No information available
- TOC:
- No information available
- Salinity:
- No information available
- Details on test conditions:
- TEST SYSTEM
- Material, size, headspace, fill volume: 25 mL acid-washed plastic vials
- Biomass loading rate: 5. 10 6+ Cells/mL
- Replicates: 3
TEST MEDIUM / WATER PARAMETERS
- Growth medium: BG11 medium which comprised: 1.5 g NaNO3, 0.04 g K2HPO4, 0.075 g MgSO4.7 H2O, 0.036 g CaCl2.2 H2O, 0.006 g citric acid, 0.006 g ferric ammonium citrate, 0.001 g disodium ethylenediaminetetraacetate (Na2EDTA), 0.02 g NaHCO3, 1 mL trace metal mix A5 (2.86 g H3BO3, 1.81 g MnCl2.4 H2O, 0.222 g ZnSO4.7 H2O, 0.039 g Na2MoO2.2 H2O, 0.079 g CuSO4.5 H2O, 0.0494 g Co(NO3)2.6 H2O in 1 L distilled water.
OTHER TEST CONDITIONS
- Adjustment of pH: 10 mM sodium acetate buffer , pH 5.0
- Light intensity: 300 µE m-2 s-1
RANGE-FINDING / PRELIMINARY STUDY
- Test concentrations: Aliquots from 10 mM and 100 mM zirconium dichloride oxide aqueous solution were added to give a final concentration in the range of 0.5-50 mM - Nominal and measured concentrations:
- Nominal concentrations : 0.5 to 50 mM of Zr
Actual concentration : 3.7 g/L - Details on estimation of bioconcentration:
- UPTAKE:
The amount of Zr taken up by cells was calculated from the reduction of Zr in the buffer, after taking into account any binding to the plastic vial (determined in control experiments without cells).
DESORPTION :
Cell suspensions were prepared in 10 mM sodium acetate buffer, pH 5.0, with 100 µM zirconium dichloride oxide. Cell suspensions were then incubated for at least 24 h in the light. Three replicate samples (1 mL) were taken from the cell suspensions and centrifuged after which the supernatant was removed and the Zr concentration measured by polarography. - Key result
- Type:
- BCF
- Value:
- 0.64 L/kg
- Basis:
- whole body d.w.
- Time of plateau:
- 4 h
- Calculation basis:
- steady state
- Remarks on result:
- other: expressed in Zr
- Remarks:
- Conc.in environment / dose:3.7 g/L
- Elimination:
- yes
- Parameter:
- other: 28 to 87% of the Zr accumulated
- Depuration time (DT):
- 5 min
- Details on results:
- Zr accumulation (µmol g dry wt-1) after 4h: 25.6+/- 0.7
Zr accumulation (µmol g dry wt-1) after 5 min: 25.0+/- 1.0 - Validity criteria fulfilled:
- yes
- Conclusions:
- In conclusion, the BCF value is very low for Chlorella emersonii. Zr accumulation in µmol g dry wt-1 was in the same order of magnitude after 5 minutes and 4 hours of exposure. Similarly, rapid desorption (within 5 min) has been observed.
- Endpoint:
- bioaccumulation in aquatic species: algae / cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Sorption/uptake - desorption study with various microalgae and cyanobacteria.
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
Zirconium dichloride oxide was used as test substance. Nevertheless, when put in water, zirconium dichloride oxide hydrolyses rapidly and precipitates as zirconium dioxide. Therefore, the actual test substance was zirconium dioxide. - Radiolabelling:
- no
- Test organisms (species):
- other: Synechococcus PCC 6301
- Details on test organisms:
- For the bioaccumulation test, algae in the exponential phase of growth were centrifuged. The supernatant was removed and the cells washed once with 10 mM sodium acetate buffer, pH 5.0. Cells were centrifuged and resuspended in 10 mM sodium acetate buffer, pH 5.0 to cell densities of 5 x 10 8 mL-1.
- Route of exposure:
- aqueous
- Test type:
- not specified
- Water / sediment media type:
- natural water: freshwater
- Total exposure / uptake duration:
- 4 h
- Total depuration duration:
- 24 h
- Hardness:
- No information available
- Test temperature:
- 23°C
- pH:
- 5
- Dissolved oxygen:
- No information available
- TOC:
- No information available
- Salinity:
- No information available
- Details on test conditions:
- TEST SYSTEM
- Material, size, headspace, fill volume: 25 mL acid-washed plastic vials
- Biomass loading rate: 5. 10 6+ Cells/mL
- Replicates: 3
TEST MEDIUM / WATER PARAMETERS
- Growth medium: BG11 medium which comprised: 1.5 g NaNO3, 0.04 g K2HPO4, 0.075 g MgSO4.7H2O, 0.036 g CaCl2.2H2O, 0.006 g citric acid, 0.006 g ferric ammonium citrate, 0.001 g disodium ethylenediaminetetraacetate (Na2EDTA), 0.02 g NaHCO3, 1 mL trace metal mix A5 (2.86 g H3BO3, 1.81 g MnCl2.4H2O, 0.222 g ZnSO4.7H2O, 0.039 g Na2MoO2.2H2O, 0.079 g CuSO4.5H2O, 0.0494 g Co(NO3)2.6H2O in 1 L distilled water.
OTHER TEST CONDITIONS
- Adjustment of pH: 10 mM sodium acetate buffer , pH 5.0
- Light intensity: 300 µE m-2 s-1
RANGE-FINDING / PRELIMINARY STUDY
- Test concentrations: Aliquots from 10 mM and 100 mM zirconium dichloride oxide aqueous solution were added to give a final concentration in the range of 0.5-50 mM - Nominal and measured concentrations:
- Nominal concentrations : 0.5 to 50 mM of Zr
Actual concentration : 3.7 g/L - Details on estimation of bioconcentration:
- UPTAKE:
The amount of Zr taken up by cells was calculated from the reduction of Zr in the buffer, after taking into account any binding to the plastic vial (determined in control experiments without cells).
DESORPTION :
Cell suspensions were prepared in 10 mM sodium acetate buffer, pH 5.0, with 100 µM zirconium dichloride oxide. Cell suspensions were then incubated for at least 24 h in the light. Three replicate samples (1 mL) were taken from the cell suspensions and centrifuged after which the supernatant was removed and the Zr concentration measured by polarography. - Type:
- BCF
- Value:
- 0.455 L/kg
- Basis:
- whole body d.w.
- Time of plateau:
- 4 h
- Calculation basis:
- steady state
- Remarks on result:
- other: expressed in Zr
- Remarks:
- Conc.in environment / dose:3.7 g/L
- Elimination:
- yes
- Parameter:
- other: 28 to 87% of the Zr accumulated
- Depuration time (DT):
- 5 min
- Details on results:
- Zr accumulation (µmol g dry wt-1) after 4h: 18.2+/- 0.8
Zr accumulation (µmol g dry wt-1) after 5 min: 19.9+/- 0.1 - Validity criteria fulfilled:
- yes
- Conclusions:
- In conclusion, the BCF value is very low for Synechococcus sp. Zr accumulation in µmol g dry wt-1 was in the same order of magnitude after 5 minutes and 4 hours of exposure. As well, rapid desorption (within 5 min) has been observed.
- Endpoint:
- bioaccumulation in aquatic species: algae / cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Sorption/uptake - desorption study with various microalgae and cyanobacteria.
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
Zirconium dichloride oxide was used as test substance. Nevertheless, when put in water, zirconium dichloride oxide hydrolyses rapidly and precipitates as zirconium dioxide. Therefore, the actual test substance was zirconium dioxide. - Radiolabelling:
- no
- Test organisms (species):
- other: Synechococcus PCC 6803
- Details on test organisms:
- For the bioaccumulation test, algae in the exponential phase of growth were centrifuged. The supernatant was removed and the cells washed once with 10 mM sodium acetate buffer, pH 5.0. Cells were centrifuged and resuspended in 10 mM sodium acetate buffer, pH 5.0 to cell densities of 5 x 10 8 mL-1.
- Route of exposure:
- aqueous
- Test type:
- not specified
- Water / sediment media type:
- natural water: freshwater
- Total exposure / uptake duration:
- 4 h
- Total depuration duration:
- 24 h
- Hardness:
- No information available
- Test temperature:
- 23°C
- pH:
- 5
- Dissolved oxygen:
- No information available
- TOC:
- No information available
- Salinity:
- No information available
- Details on test conditions:
- TEST SYSTEM
- Material, size, headspace, fill volume: 25 mL acid-washed plastic vials
- Biomass loading rate: 5. 10 8+ Cells/mL
- Replicates: 3
TEST MEDIUM / WATER PARAMETERS
- Growth medium: BG11 medium which comprised: 1.5 g NaNO3, 0.04 g K2HPO4, 0.075 g MgSO4.7H2O, 0.036 g CaCl2.2H2O, 0.006 g citric acid, 0.006 g ferric ammonium citrate, 0.001 g disodium ethylenediaminetetraacetate (Na2EDTA), 0.02 g NaHCO3, 1 mL trace metal mix A5 (2.86 g H3BO3, 1.81 g MnCl2.4H2O, 0.222 g ZnSO4.7H2O, 0.039 g Na2MoO2.2H2O, 0.079 g CuSO4.5H2O, 0.0494 g Co(NO3)2.6 H2O in 1 L distilled water.
OTHER TEST CONDITIONS
- Adjustment of pH: 10 mM sodium acetate buffer , pH 5.0
- Light intensity: 300 µE m-2 s-1
RANGE-FINDING / PRELIMINARY STUDY
- Test concentrations: Aliquots from 10 mM and 100 mM zirconium dichloride oxide aqueous solution were added to give a final concentration in the range of 0.5-50 mM - Nominal and measured concentrations:
- Nominal concentrations : 0.5 to 50 mM of Zr
Actual concentration : 3.7 g/L - Details on estimation of bioconcentration:
- UPTAKE:
The amount of Zr taken up by cells was calculated from the reduction of Zr in the buffer, after taking into account any binding to the plastic vial (determined in control experiments without cells).
DESORPTION :
Cell suspensions were prepared in 10 mM sodium acetate buffer, pH 5.0, with 100 µM zirconium dichloride oxide. Cell suspensions were then incubated for at least 24 h in the light. Three replicate samples (1 mL) were taken from the cell suspensions and centrifuged after which the supernatant was removed and the Zr concentration measured by polarography. - Type:
- BCF
- Value:
- 0.052 L/kg
- Basis:
- whole body d.w.
- Time of plateau:
- 4 h
- Calculation basis:
- steady state
- Remarks on result:
- other: expressed in Zr
- Remarks:
- Conc.in environment / dose:3.7 g/L
- Elimination:
- yes
- Parameter:
- other: 28 to 87% of the Zr accumulated
- Depuration time (DT):
- 5 min
- Details on results:
- Zr accumulation (µmol g dry wt-1) after 4h: 2.1+/- 0.5
Zr accumulation (µmol g dry wt-1) after 5 min: 1.85+/- 0.2 - Validity criteria fulfilled:
- yes
- Conclusions:
- In conclusion, the BCF value is very low for Synechococcus sp. Zr accumulation in µmol g dry wt-1 was at the same order of magnitude after 5 minutes and 4 hours of exposure. As well, rapid desorption (within 5 min) has been observed.
- Endpoint:
- bioaccumulation in aquatic species: algae / cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Sorption/uptake - desorption study with various microalgae and cyanobacteria.
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
Zirconium dichloride oxide was used as test substance. Nevertheless, when put in water, zirconium dichloride oxide hydrolyses rapidly and precipitates as zirconium dioxide. Therefore, the actual test substance was zirconium dioxide. - Radiolabelling:
- no
- Test organisms (species):
- other: Plectonema boryanum
- Details on test organisms:
- For the bioaccumulation test, algae in the exponential phase of growth were centrifuged. The supernatant was removed and the cells washed once with 10 mM sodium acetate buffer, pH 5.0. Cells were centrifuged and resuspended in 10 mM sodium acetate buffer, pH 5.0 to cell densities of OD680 of approx. 6.
- Route of exposure:
- aqueous
- Test type:
- not specified
- Water / sediment media type:
- natural water: freshwater
- Total exposure / uptake duration:
- 4 h
- Total depuration duration:
- 24 h
- Hardness:
- No information available
- Test temperature:
- 23°C
- pH:
- 5
- Dissolved oxygen:
- No information available
- TOC:
- No information available
- Salinity:
- No information available
- Details on test conditions:
- TEST SYSTEM
- Material, size, headspace, fill volume: 25 mL acid-washed plastic vials
- Biomass loading rate: OD680 of approx. 6
- Replicates: 3
TEST MEDIUM / WATER PARAMETERS
- Growth medium: BG11 medium which comprised: 1.5 g NaNO3, 0.04 g K2HPO4, 0.075 g MgSO4.7H2O, 0.036 g CaCl2.2H2O, 0.006 g citric acid, 0.006 g ferric ammonium citrate, 0.001 g disodium ethylenediaminetetraacetate (Na2EDTA), 0.02 g NaHCO3, 1 mL trace metal mix A5 (2.86 g H3BO3, 1.81 g MnCl2.4H2O, 0.222 g ZnSO4.7H2O, 0.039 g Na2MoO2.2H2O, 0.079 g CuSO4.5H2O, 0.0494 g Co(NO3)2.6 H2O in 1 L distilled water).
OTHER TEST CONDITIONS
- Adjustment of pH: 10 mM sodium acetate buffer , pH 5.0
- Light intensity: 300 µE m-2 s-1
RANGE-FINDING / PRELIMINARY STUDY
- Test concentrations: Aliquots from 10 mM and 100 mM zirconium dichloride oxide aqueous solution were added to give a final concentration in the range of 0.5-50 mM - Nominal and measured concentrations:
- Nominal concentrations : 0.5 to 50 mM of Zr
Actual concentration : 3.7 g/L - Details on estimation of bioconcentration:
- UPTAKE:
The amount of Zr taken up by cells was calculated from the reduction of Zr in the buffer, after taking into account any binding to the plastic vial (determined in control experiments without cells).
DESORPTION :
Cells suspensions were prepared in 10 mM sodium acetate buffer, pH 5.0, with 100 µM zirconium dichloride oxide. Cell suspensions were then incubated for at least 24 h in the light. Three replicates samples (1 mL) were taken from the cell suspensions and centrifuged after which the supernatant was removed and the Zr concentration measured by polarography. - Type:
- BCF
- Value:
- 0.4 L/kg
- Basis:
- whole body d.w.
- Time of plateau:
- 4 h
- Calculation basis:
- steady state
- Remarks on result:
- other: expressed in Zr
- Remarks:
- Conc.in environment / dose:3.7 g/L
- Elimination:
- yes
- Parameter:
- other: 28 to 87% of the Zr accumulated
- Depuration time (DT):
- 5 min
- Details on results:
- Zr accumulation (µmol g dry wt-1) after 4h: 16.0+/- 0.1
Zr accumulation (µmol g dry wt-1) after 5 min: 16.8+/- 0.1 - Validity criteria fulfilled:
- yes
- Conclusions:
- In conclusion, the BCF value is very low for Plectonema boryanum. Zr accumulation in µmol g dry wt-1 was at the same order of magnitude after 5 minutes and 4 hours of exposure. As well, rapid desorption (within 5 min) has been observed.
- Endpoint:
- bioaccumulation in aquatic species: algae / cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Sorption/uptake - desorption study with various microalgae and cyanobacteria.
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
Zirconium dichloride oxide was used as test substance. Nevertheless, when put in water, zirconium dichloride oxide hydrolyses rapidly and precipitates as zirconium dioxide. Therefore, the actual test substance was zirconium dioxide. - Radiolabelling:
- no
- Test organisms (species):
- other: Scenedesmus obliquus
- Details on test organisms:
- For the bioaccumulation test, algae in the exponential phase of growth were centrifuged. The supernatant was removed and the cells washed once with 10 mM sodium acetate buffer, pH 5.0. Cells were centrifuged and resuspended in 10 mM sodium acetate buffer, pH 5.0 to cell densities of 5 x 10 7 mL-1.
- Route of exposure:
- aqueous
- Test type:
- not specified
- Water / sediment media type:
- natural water: freshwater
- Total exposure / uptake duration:
- 4 h
- Total depuration duration:
- 24 h
- Hardness:
- No information available
- Test temperature:
- 23°C
- pH:
- 5
- Dissolved oxygen:
- No information available
- TOC:
- No information available
- Salinity:
- No information available
- Details on test conditions:
- TEST SYSTEM
- Material, size, headspace, fill volume: 25 mL acid-washed plastic vials
- Biomass loading rate: 5. 10 7+ Cells/mL
- Replicates: 3
TEST MEDIUM / WATER PARAMETERS
- Growth medium: BG11 medium which comprised: 1.5 g NaNO3, 0.04 g K2HPO4, 0.075 g MgSO4.7H2O, 0.036 g CaCl2.2H2O, 0.006 g citric acid, 0.006 g ferric ammonium citrate, 0.001 g disodium ethylenediaminetetraacetate (Na2EDTA), 0.02 g NaHCO3, 1 mL trace metal mix A5 (2.86 g H3BO3, 1.81 g MnCl2.4H2O, 0.222 g ZnSO4.7H2O, 0.039 g Na2MoO2.2H2O, 0.079 g CuSO4.5H2O, 0.0494 g Co(NO3)2.6 H2O in 1 L distilled water.
OTHER TEST CONDITIONS
- Adjustment of pH: 10 mM sodium acetate buffer , pH 5.0
- Light intensity: 300 µE m-2 s-1
RANGE-FINDING / PRELIMINARY STUDY
- Test concentrations: Aliquots from 10 mM and 100 mM zirconium dichloride oxide aqueous solution were added to give a final concentration in the range of 0.5-50 mM - Nominal and measured concentrations:
- Nominal concentrations : 0.5 to 50 mM of Zr
Actual concentration : 3.7 g/L - Details on estimation of bioconcentration:
- UPTAKE:
The amount of Zr taken up by cells was calculated from the reduction of Zr in the buffer, after taking into account any binding to the plastic vial (determined in control experiments without cells).
DESORPTION :
Cell suspensions were prepared in 10 mM sodium acetate buffer, pH 5.0, with 100 µM zirconium dichloride oxide. Cell suspensions were then incubated for at least 24 h in the light. Three replicate samples (1 mL) were taken from the cell suspensions and centrifuged after which the supernatant was removed and the Zr concentration measured by polarography. - Type:
- BCF
- Value:
- 0.55 L/kg
- Basis:
- whole body d.w.
- Time of plateau:
- 4 h
- Calculation basis:
- steady state
- Remarks on result:
- other: expressed in Zr
- Remarks:
- Conc.in environment / dose:3.7 g/L
- Elimination:
- yes
- Parameter:
- other: 28 to 87% of the Zr accumulated
- Depuration time (DT):
- 5 min
- Details on results:
- Zr accumulation (µmol g dry wt-1) after 4h: 22.0+/- 0.6
Zr accumulation (µmol g dry wt-1) after 4h: 21.3+/- 0.5 - Validity criteria fulfilled:
- yes
- Conclusions:
- In conclusion, the BCF value is very low for Scenedesmus obliquus. Zr accumulation in µmol g dry wt-1 was at the same order of magnitude after 5 minutes and 4 hours of exposure. As well, rapid desorption (within 5 min) has been observed.
- Endpoint:
- bioaccumulation in aquatic species: algae / cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Sorption/uptake - desorption study with various microalgae and cyanobacteria.
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
Zirconium dichloride oxide was used as test substance. Nevertheless, when put in water, zirconium dichloride oxide hydrolises rapidly and precipitates as zirconium dioxide. Therefore, the actual test substance was zirconium dioxide. - Radiolabelling:
- no
- Test organisms (species):
- other: Chlamydomonas reinhardtii
- Details on test organisms:
- For the bioaccumulation test, algae in the exponential phase of growth were centrifuged. The supernatant was removed and the cells washed once with 10 mM sodium acetate buffer, pH 5.0. Cells were centrifuged and resuspended in 10 mM sodium acetate buffer, pH 5.0 to cell densities of 1 x 10 7 mL-1.
- Route of exposure:
- aqueous
- Test type:
- not specified
- Water / sediment media type:
- natural water: freshwater
- Total exposure / uptake duration:
- 4 h
- Total depuration duration:
- 24 h
- Hardness:
- No information available
- Test temperature:
- 23°C
- pH:
- 5
- Dissolved oxygen:
- No information available
- TOC:
- No information available
- Salinity:
- No information available
- Details on test conditions:
- TEST SYSTEM
- Material, size, headspace, fill volume: 25 mL acid-washed plastic vials
- Biomass loading rate: 1. 10 7+ Cells/mL
- Replicates: 3
TEST MEDIUM / WATER PARAMETERS
- Growth medium: BG11 medium which comprised: 1.5 g NaNO3, 0.04 g K2HPO4, 0.075 g MgSO4.7H2O, 0.036 g CaCl2.2H2O, 0.006 g citric acid, 0.006 g ferric ammonium citrate, 0.001 g disodium ethylenediaminetetraacetate (Na2EDTA), 0.02 g NaHCO3, 1 mL trace metal mix A5 (2.86 g H3BO3, 1.81 g MnCl2.4H2O, 0.222 g ZnSO4.7H2O, 0.039 g Na2MoO2.2H2O, 0.079 g CuSO4.5H2O, 0.0494 g Co(NO3)2.6H2O in 1 L distilled water.
OTHER TEST CONDITIONS
- Adjustment of pH: 10 mM sodium acetate buffer , pH 5.0
- Light intensity: 300 µE m-2 s-1
RANGE-FINDING / PRELIMINARY STUDY
- Test concentrations: Aliquots from 10 mM and 100 mM zirconium dichloride oxide aqueous solution were added to give a final concentration in the range of 0.5-50 mM - Nominal and measured concentrations:
- Nominal concentrations : 0.5 to 50 mM of Zr
Actual concentration : 3.7 g/L - Details on estimation of bioconcentration:
- UPTAKE:
The amount of Zr taken up by cells was calculated from the reduction of Zr in the buffer, after taking into account any binding to the plastic vial (determined in control experiments without cells).
DESORPTION :
Cell suspensions were prepared in 10 mM sodium acetate buffer, pH 5.0, with 100 µM zirconium dichloride oxide. Cell suspensions were then incubated for at least 24 h in the light. Three replicate samples (1 mL) were taken from the cell suspensions and centrifuged after which the supernatant was removed and the Zr concentration measured by polarography. - Type:
- BCF
- Value:
- 0.188 L/kg
- Basis:
- whole body d.w.
- Time of plateau:
- 4 h
- Calculation basis:
- steady state
- Remarks on result:
- other: expressed in Zr
- Remarks:
- Conc.in environment / dose:3.7 g/L
- Elimination:
- yes
- Parameter:
- other: 28 to 87% of the Zr accumulated
- Depuration time (DT):
- 5 min
- Details on results:
- Zr accumulation (µmol g dry wt-1) after 4h: 7.5+/- 0.5
Zr accumulation (µmol g dry wt-1) after 5 min : 11.2+/- 0.6 - Validity criteria fulfilled:
- yes
- Conclusions:
- In conclusion, the BCF value is very low for Chlamydomonas reinhardtii. Zr accumulation in µmol g dry wt-1 was at the same order of magnitude after 5 minutes and 4 hours of exposure. As well, rapid desorption (within 5 min) has been observed.
Referenceopen allclose all
Description of key information
Following the read-across strategy, it is considered appropriate to cover this endpoint by a key study performed with zirconium dichloride oxide. This study (Garnham et al., 1993) was assigned a Klimisch score of 2 (reliable with restrictions). Bioconcentration factors were measured in cyanobacteria and microalgae and observed to be low. A key BCF value of 0.064 L/kg ww was selected as a worst case key value.
Key value for chemical safety assessment
- BCF (aquatic species):
- 0.064 L/kg ww
Additional information
The accumulation of zirconium by cyanobacteria and microalgae was characterized by Garnham et al. (1993). In this study the organisms were exposed to solutions of zirconium dichloride oxide. Actual exposure however was rather to zirconium dioxide, since zirconium dichloride oxide hydrolyses rapidly in aqueous solutions at environmentally relevant pH, resulting in the precipitation of zirconium as zirconium dioxide or hydroxide. In all cyanobacterial and microalgal species examined, accumulation consisted of a single rapid energy-independent phase ("biosorption"). No energy-dependent accumulation was observed. Biosorption of zirconium was concentration-dependent, followed a Freundlich adsorption isotherm, and was dependent on pH, showing decreasing accumulation with decreasing pH. Zirconium desorption from micro-algae and cyanobacteria was increased by increasing external cation concentrations or by decreasing the pH of the desorption agent. Overall, biosorption/bioaccumulation was very limited. BCF values between 0.0525 and 0.64 L/kg dw were obtained. Assuming 90% water content in the organisms, the highest value can be recalculated to a BCF of 0.064 L/kg ww. This highest value can be considered as key value.
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