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Diss Factsheets
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EC number: 230-303-5 | CAS number: 7023-61-2
- 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
Link to relevant study record(s)
- 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
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
- GLP compliance:
- yes
- Specific details on test material used for the study:
- - Storage condition of test material: At room temperature at about 20 °C, away from direct sunlight
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- - Source of inoculum/activated sludge: aerobic activated sludge from a wastewater treatment treating predominantly domestic wastewater
- Preparation of inoculum for exposure: Sludge was washed twice with tap water by centrifugation and the supernatant liquid phase was decanted. A homogenized aliquot of the final sludge suspension was weighed, thereafter dried and the ratio of wet to dry weight was calculated. Based on this ratio, calculated amounts of wet sludge were suspended in test water to obtain a concentration equivalent to 4 g (±10%) dry material per liter. During the holding period of one day prior to use, the sludge was aerated at room temperature. Prior to use, the sludge was diluted with test water to a concentration of about 1 g dry material per liter. Defined volumes of this diluted activated sludge were added to test water to obtain a final concentration of 30 mg dry material per liter. - Duration of test (contact time):
- 28 d
- Initial conc.:
- 33 mg/L
- Based on:
- test mat.
- Initial conc.:
- 15.3 mg/L
- Based on:
- TOC
- Parameter followed for biodegradation estimation:
- CO2 evolution
- Details on study design:
- TEST CONDITIONS
- Composition of medium: One day before test start (Day-1), between 2400 and 3000 mL of untreated test medium was filled into the flasks and 90 ml activated sludge inoculum was added. Then aeration overnight with C02-free air on the following day (Day 0), defined amounts of the test item were directly added to the test flasks and made up to a volume of 3 L with test water.
- Solubilising agent: none
- Test temperature: 21-23 °C
- pH: 7.2 - 7.4
- Continuous darkness: yes
TEST SYSTEM
- Culturing apparatus: 5-liter all-glass amber bottles
- Number of culture flasks/concentration: 2
- Method used to create aerobic conditions: air was led through a bottle containing about 750 mL of a 2 M NaOH solution to trap CO2. The CO2-free air was passed through the test solutions at a rate corresponding to about 30-100 mL/min.
- Details of trap for CO2 and volatile organics: two absorber flasks, the first one containing 300 mL 0.05 M NaOH and the second one containing 200 mL 0.05 M NaOH, were connected in series to the exit air line of each test flask.
SAMPLING
- Sampling frequency test item and inoculum control: day 2, 5, 7, 9, 12, 14, 19, 23, 27, 28, 29
- Sampling frequency procedure control: day 2, 7, 14, 28, 29
- Sampling frequency toxicity control: day 7, 14, 28, 29
- Sampling method: aliquot of 5.0 mL withdrawn from the absorber flask nearest to the test flask for analysis of inorganic carbon
CONTROL AND BLANK SYSTEM
- Inoculum blank: 2 replicates
- Toxicity control: 1 replicate
- Procedure control: 2 replicates - Reference substance:
- benzoic acid, sodium salt
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 0
- Sampling time:
- 28 d
- Results with reference substance:
- Mean degradation rate after 28 days = 77.1%
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- under test conditions no biodegradation observed
Reference
Description of key information
Poorly biodegradable.
Key value for chemical safety assessment
Additional information
In a test following OECD guideline 301B the ready biodegradability of the substance was tested. Based on the CO2 evolution a degradation rate of 0 % was determined after 28 days inoculation time (RCC Ltd, 2007).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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