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Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP-study

Data source

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

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method C.4-B (Determination of the "Ready" Biodegradability - Modified OECD Screening Test)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
other: Mixed population of aquatic microorganisms; aeration tank of a wastewater plant treating predominantly domestic sewage
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
18.4 mg/L
Based on:
test mat.
Reference substance
Reference substance:
aniline

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (DOC removal)
Value:
0
Sampling time:
0 h
Parameter:
% degradation (DOC removal)
Value:
9
Sampling time:
7 d
Parameter:
% degradation (DOC removal)
Value:
26
Sampling time:
14 d
Parameter:
% degradation (DOC removal)
Value:
23
Sampling time:
21 d
Parameter:
% degradation (DOC removal)
Value:
23
Sampling time:
28 d

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
With a degradation of 23 % after 28 days the substance is not readily biodegradable.