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
Study period:
2008-2009
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution 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, adapted
Duration of test (contact time):
> 1 - <= 29 d
Initial test substance concentration
Initial conc.:
>= 18.3 - <= 20 mg/L
Based on:
DOC

Results and discussion

% Degradation
Parameter:
% degradation (CO2 evolution)
Value:
>= 13 - <= 16.6
St. dev.:
1.8
Sampling time:
28 d
Details on results:
The following data were determined for the test item B 1061:
10-day-window: not detected
degradation at the end of 10-day-windows: none
degradation at the end of the test: 15 %
demanded pass level: 60 % at the end of 10-day-window
Therefore, regardless of application of the 10-day-window, B 1061 is not readily biodegradable following OECD 301B/EU C.4-C.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
other: not readily biodegradable
Executive summary:

Results for the test item B 1061 are:

- The test item B 1061 is considered as " not readily biodegradable".

- The degree of biodegradation reached 15 % after 28 days.

- A 10 -day-window was not observed. The pass level of 60 % given in the OECD guideline was missed.

- The abiotic degradation reached 9 %.

- All validity criteria were met.