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EC number: 920-338-0 | CAS number: 109236-76-2
- 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:
- other: The study was conducted according to an applicable guideline under GLP-conditions.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 009
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- docosyl 4-hydroxybenzoate
- EC Number:
- 920-338-0
- Cas Number:
- 109236-76-2
- Molecular formula:
- C29 H50 O3
- IUPAC Name:
- docosyl 4-hydroxybenzoate
- Test material form:
- solid: particulate/powder
- Remarks:
- migrated information: powder
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- Municipal sewage treatment plant, D-31137 Hildesheim.
Activated sludge from the sewage plant at Hildesheim is well suited as it receives predominantly municipal sewage and hardly industrial chemical
waste.
The activated sludge was washed twice with autoclaved tap water. After the second washing the settled sludge was filled up with mineral salts
medium and was maintained in an aerobic condition by aeration for four hours. Thereafter the sludge was homogenized with a blender. The
supernatant was decanted and maintained in an aerobic condition by aeration with C02 free air for 5 days. 10 mL/L were used to initiate
inoculation. - Duration of test (contact time):
- 28 d
Initial test substance concentration
- Initial conc.:
- 15 mg/L
- Based on:
- ThOD/L
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- CO2 evolution
- Details on study design:
- Study of ready biodegradability over a period of 28 days with a non-adapted activated siudge in order to check the rate of biodegradation in % by determination of evolved C02.
Results and discussion
- Preliminary study:
- Based on the carbon content a ThCC>2 of 2.85 mg CO2/mg test item was calculated. A test concentration of 15 mg/L, corresponding to a carbon
content of 11.7 mg C/L in the test vessels was selected. - Test performance:
- The ready biodegradability of the test item 4-Hydroxybenzoic acid behenylester was determined with a non adapted activated sludge over a test
period of 28 days in the Modified Sturm Test. The study was conducted according to OECD 301 B. The test item was tested at a concentration of
15 mg/L in duplicates, corresponding to a carbon content (TOC) of 11.7 mgC/L in the test vessels. The biodegradation of the test item was followed
by titrimetric analysis of the quantity of C02 produced by the respiration of bacteria. The degradation was stopped on day 28 by acidification of the
test solutions. The last titration was made on day 29, after residual CO2 had been purged from the test solutions over a period of 24 h. The
percentage C02 production was calculated in relation to the theoretical C02 production (ThC02) of the test item. The biodegradation rate was
calculated for each titration time.
To check the activity of the test system, sodium benzoate was used as functional control. The percentage degradation of the functional control
reached the pass level of 60 % after 6 days and achieved 90 % after 14 days.
% Degradation
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 89
- Sampling time:
- 28 d
BOD5 / COD results
- Results with reference substance:
- To check the activity of the test system, sodium benzoate was used as functional control. The percentage degradation of the functional control reached the pass level of 60 % after 6 days and achieved 90 % after 14 days.
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable, but failing 10-day window
- Conclusions:
- The test item is considered to be biodegradable, but failing the 10-day window. The missing of the 10 day window might be caused by the poor solubility of the substance.
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