Registration Dossier

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: Guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Report Date:
1994

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test)
Deviations:
no
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic (adaptation not specified)
Duration of test (contact time):
16 d
Initial test substance concentration
Initial conc.:
40 mg/L
Based on:
DOC

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (DOC removal)
Value:
97
Sampling time:
16 d
Parameter:
% degradation (DOC removal)
Value:
95
Sampling time:
13 d
Parameter:
% degradation (DOC removal)
Value:
92
Sampling time:
9 d
Parameter:
% degradation (DOC removal)
Value:
93
Sampling time:
6 d

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable
Conclusions:
The final degradation value after the test period of 16 d was 97%. The control substance was degraded to 99% within 13 days. From the data obtained the test material may be reagarded as readily biodegradable.