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:
1991
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: well performed OECD study with GLP

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1991
Report Date:
1991

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
other: 79/831/EWG (Teil C)
Qualifier:
according to
Guideline:
other: OECD 301 F draft Oct. 1990
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:
source: domestic waste water treatment plant Frankfurt/M-Sindlingen
not adapted to the test item or the reference substance
pre-treatment: one week aeration in the nutrient salt solution
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
445 mg/L
Based on:
test mat.
Details on study design:
BSB-bottles as reaction vessels
incubation in a WTW-BSB-apparatus at 20+-1°C

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (O2 consumption)
Value:
0
Sampling time:
7 d
Parameter:
% degradation (O2 consumption)
Value:
0
Sampling time:
14 d
Parameter:
% degradation (O2 consumption)
Value:
0
Sampling time:
21 d
Parameter:
% degradation (O2 consumption)
Value:
0
Sampling time:
28 d

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
other: not readily biodegradable
Conclusions:
The substances has to be considered as not readily biodegradable .
Executive summary:

The substance was tested for ready biodegradation according to the guideline 79/831/EWG (part C) and also to the draft of the OECD guideline 301F. Incubation time was 28 days and incubation temperature 20 +-1°C. During that time the oxygen consumption was measured by a respirometer. No oxygen consumption was observed within 28 days.