Registration Dossier
Registration Dossier
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EC number: 407-770-0 | CAS number: 61597-96-4 D(+)-LACTATE D'ISOBUTYLE
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 992
- Report date:
- 1992
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test)
- GLP compliance:
- no
Test material
- Reference substance name:
- 2-methylpropyl-(R)-2-hydroxypropanoate
- EC Number:
- 407-770-0
- EC Name:
- 2-methylpropyl-(R)-2-hydroxypropanoate
- Cas Number:
- 61597-96-4
- Molecular formula:
- C7 H14 O3
- IUPAC Name:
- 2-methylpropyl-(R)-2-hydroxypropanoate
- Details on test material:
- - Name of test material (as cited in study report): D-Milchsäureisobutylester
- Physical state: fluid
- Analytical purity: 99%
- Batch No.: Cont. TTTU 119 618
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- sewage, domestic, non-adapted
- Details on inoculum:
- - Source of inoculum/activated sludge: Effluent of a laboratory wastewater plant treating municipal sewage
- Duration of test (contact time):
- 28 d
Initial test substance concentration
- Initial conc.:
- 20 mg/L
- Based on:
- DOC
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- DOC removal
- Details on study design:
- SAMPLING
- Sampling frequency: after 0, 1, 4, 6, 10, 14, 17, 20, 24, 27, 28 days
CONTROL AND BLANK SYSTEM
- Inoculum blank: 2 replicates
- Reference substance: 1 replicate
- Toxicity control: 1 replicate
Reference substance
- Reference substance:
- benzoic acid, sodium salt
Results and discussion
% Degradation
- Parameter:
- % degradation (DOC removal)
- Value:
- 96
- Sampling time:
- 28 d
- Details on results:
- - Kinetic of the degradation process:
after day 1: 7.4%
after day 4: 46.5%
after day 6: 76.6%
after day 20: 95.3%
BOD5 / COD results
- Results with reference substance:
- - Degradation of reference substance: 99% after 28 days
Applicant's summary and conclusion
- Interpretation of results:
- readily biodegradable
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