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: GLP study according to EU / OECD guideline.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2006

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method C.4-D (Determination of the "Ready" Biodegradability - Manometric Respirometry Test)
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: solid

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
other: mixed population of aquatic microorganisms (activated sludge)
Duration of test (contact time):
28
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
12.9
Sampling time:
7 d
Parameter:
% degradation (O2 consumption)
Value:
19.5
Sampling time:
14 d
Parameter:
% degradation (O2 consumption)
Value:
24.8
Sampling time:
21 d
Parameter:
% degradation (O2 consumption)
Value:
22.2
Sampling time:
28 d

BOD5 / COD results

Results with reference substance:
The reference compound sodium benzoate showed 85.5 % degradation after 14 days.

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The test item is considered to be "Not Readily Biodegradable".