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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
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:
data from handbook or collection of data
Justification for type of information:
Data is from authoritative database.
Qualifier:
according to
Guideline:
other: refer below principle
Principles of method if other than guideline:
The objective of the study was to determine percent biodegradation of test chemical in water for 28 days.
GLP compliance:
not specified
Oxygen conditions:
not specified
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
- Concentration of sludge: 30 mg/l
Duration of test (contact time):
28 d
Initial conc.:
100 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation:
O2 consumption
Parameter followed for biodegradation estimation:
other: HPLC
Details on study design:
- Test equipment: Standard
Key result
Parameter:
% degradation (O2 consumption)
Value:
0
Sampling time:
28 d
Parameter:
other: HPLC
Value:
2
Sampling time:
28 d
Details on results:
Study was conducted to determine percent degradation of test chemical. Test chemical undergoes 0 and 2% degradation by O2 consumption and HPLC parameter in 28 days.
Validity criteria fulfilled:
not specified
Interpretation of results:
not readily biodegradable
Conclusions:
Study was conducted to determine percent degradation of test chemical. Test chemical undergoes 0 and 2% degradation by O2 consumption and HPLC parameter in 28 days.
Executive summary:

Biodegradation study was conducted for 28 days for evaluating the percentage biodegradability of test chemical. Activated sludge was used as a test inoculums for the study. Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l, respectively. The percentage degradation of test chemical was determined to be 0 and 2 % degradation by O2 consumption and HPLC parameter in 28 days. Thus, based on percentage degradation, test chemical is considered to be not readily biodegradable in water.

Description of key information

Study was conducted to determine percent degradation of test chemical. Test chemical undergoes 0 and 2% degradation by O2 consumption and HPLC parameter in 28 days.

Key value for chemical safety assessment

Biodegradation in water:
not biodegradable
Type of water:
freshwater

Additional information

Biodegradation study was conducted for 28 days for evaluating the percentage biodegradability of test chemical. Activated sludge was used as a test inoculums for the study. Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l, respectively. The percentage degradation of test chemical was determined to be 0 and 2 % degradation by O2 consumption and HPLC parameter in 28 days. Thus, based on percentage degradation, test chemical is considered to be not readily biodegradable in water.