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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:
supporting study
Study period:
1996-07-30 to 1996-10-17
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study performed acc. to Guideline, is well documented and was done under GLP

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1996
Report Date:
1996

Materials and methods

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

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic, non-adapted
Details on inoculum:
in test system 528 mg/L dry matter
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
564 mg/L
Based on:
test mat.
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
CO2 evolution
Reference substance
Reference substance:
diethylene glycol

Results and discussion

% Degradation
Parameter:
% degradation (CO2 evolution)
Value:
< 20
Sampling time:
28 d

BOD5 / COD results

Results with reference substance:
CO2 Evolution >60% after 11d

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The test substance under the conditions of this test can be regarded as not significantly biodegradable The degradation remained below 20%.
Executive summary:

.