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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
1989
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1989
Report Date:
1989

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, adapted
Details on inoculum:
Source: ARA Kelsterbach / ARA Hoechst (70:30)
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
200 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
DOC removal
Reference substance
Reference substance:
not specified

Results and discussion

% Degradation
Parameter:
% degradation (DOC removal)
Value:
57
Sampling time:
28 d
Remarks on result:
other: 17% adsorption (3 h) considered

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Interpretation of results:
inherently biodegradable, not fulfilling specific criteria
Conclusions:
The substance was found to be inherently biodegradable. However, the documentation is insufficient for further assessment. No information given on negative and positive controls. Adsoprtion to activated sludge particles was considered based on an adsoprtion rate of ca. 17% after 3 hours.