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EC number: 201-303-2 | CAS number: 80-71-7
- 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

Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- 2-hydroxy-3-methylcyclopent-2-enone
- EC Number:
- 201-303-2
- EC Name:
- 2-hydroxy-3-methylcyclopent-2-enone
- Cas Number:
- 80-71-7
- Molecular formula:
- C6H8O2
- IUPAC Name:
- 2-hydroxy-3-methylcyclopent-2-en-1-one
Constituent 1
- Specific details on test material used for the study:
- Test Item
Designation in Test Facility: Methyl Cyclopentenolone
Date of Receipt: 14. Jul. 2017
Condition at Receipt: Room temperature, in proper conditions
Specification
The following information concerning identity and composition of the test item was pro-vided by the sponsor.
Name Methyl Cyclopentenolone
Batch no. D270001706002
Appearance white, crystal powder
Composition Methyl Cyclopentenolone
CAS No. 80-71-7
EINECS-No. 201-303-2
Molecular formula C6H8O2
Molecular weight 112.13 g/mol
Purity >99.0%
Homogeneity homogeneous
Vapour pressure unknown
Stability H2O: unknown; EtOH: unknown; acetone: unknown; CH3CN: unknown; DMSO: unknown
Solubility H2O: < 0.1 g/L; EtOH: >1 g/L; acetone: >1 g/L;
CH3CN: >1 g/L; DMSO: >1 g/L
Production date 08. Jun. 2017
Expiry date 07. Jun. 2018
Storage Room Temperature (20 ± 5°C)
Storage in Test Facility
The test item was stored in the test facility in a closed vessel at room temperature (20 ± 5°C) protected from light and humidity.
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic (adaptation not specified)
- Details on inoculum:
- Activated sludge was used as inoculum.
Activated sludge from a biologic sewage treatment plant was used. The chosen plant is treating mostly household sewage.
The sludge was taken from the activation basin of the ESN (Stadtentsorgung Neustadt) sewage treatment plant, Im Altenschemel, NW-Lachen-Speyerdorf.
Date of collection: 25. Oct. 2017, batch no: 20171025
The sludge was filtrated, washed with medium 2x and re-suspended in test medium. It was then aerated.
The dry matter was determined as 4560 mg suspended solids/L. - Duration of test (contact time):
- 28 d
Initial test substance concentration
- Initial conc.:
- 50 mg/L
- Based on:
- test mat.
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- O2 consumption
Results and discussion
% Degradation
- Key result
- Parameter:
- % degradation (O2 consumption)
- Value:
- 74
- Sampling time:
- 28 d
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable
- Conclusions:
- The degree of biodegradation reached 74% after 28 days
The degradation phase was from day 8 – day 17 (67%).
The 10-day-window began on day 8 (this is stated as lag phase), at its end (day 18), 69 % were reached, surpassing the pass level of 60 % given in the OECD guideline.
Therefore, when applying the 10-day-window, the test item Methyl Cyclopentenolone is readily biodegradable following OECD 301F/EU C.4-D.
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