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EC number: 224-832-0 | CAS number: 4511-42-6
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)
Data source
Reference
- Reference Type:
- publication
- Title:
- The ecotoxicity and biodegradability of lactic acid, alkyl lactate esters and lactate salts.
- Author:
- Bowmer, C.T., Hooftman, R.N., Hansveit, O.A, Venderbosch, P.W.M and Van der Hoeven, N.
- Year:
- 1 998
- Bibliographic source:
- Chemosphere, Vol. 37, 1317-1333
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.5 (Degradation: Biochemical Oxygen Demand)
- GLP compliance:
- no
Test material
- Reference substance name:
- (3S-cis)-3,6-dimethyl-1,4-dioxane-2,5-dione
- EC Number:
- 224-832-0
- EC Name:
- (3S-cis)-3,6-dimethyl-1,4-dioxane-2,5-dione
- Cas Number:
- 4511-42-6
- Molecular formula:
- C6H8O4
- IUPAC Name:
- 3,6-dimethyl-1,4-dioxane-2,5-dione
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Duration of test (contact time):
- 20 d
Initial test substance concentration
- Initial conc.:
- 4 mg/L
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- O2 consumption
Results and discussion
% Degradation
- Parameter:
- other: BOD
- Value:
- ca. 60
- Sampling time:
- 10 h
- Details on results:
BOD 20 = 0.60 mg O2 per mg test substance
BOD5 / COD results
BOD5 / CODopen allclose all
- Parameter:
- BOD5
- Value:
- 0.45 g O2/g test mat.
- Parameter:
- COD
- Value:
- 0.85 g O2/g test mat.
- Parameter:
- BOD5*100/COD
- Value:
- 50
Any other information on results incl. tables
Year of BOD5 method: 1998 (unclear if "Year of test guideline" or "Year of study completion".
RM-Freetext:
A7.1.1.2.1-02
Applicant's summary and conclusion
- Validity criteria fulfilled:
- not applicable
- Interpretation of results:
- readily biodegradable, but failing 10-day window
- Conclusions:
- Lactic acid is readily biodegradable
- Executive summary:
The biodegradation of lactic acid and lactate esters was studied. The aim of the study was to provide predicted environmental data for additional alkyl homologues and metal salts. Lactic acid and its alkyl esters were degraded for more than 60% in the ready biodegradability tests and from the data presented, it is evident that lactic acid and the majority of alkyl lactates are readily biodegradable.
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