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
Year:
1994
Report Date:
1994

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 301 A (Ready Biodegradability: DOC Die Away Test)
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Acryloxibutylchlorformiat: ca. 75 %

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge, domestic (adaptation not specified)
Duration of test (contact time):
22 d
Initial test substance concentrationopen allclose all
Initial conc.:
20 mg/L
Based on:
DOC
Initial conc.:
53.5 mg/L
Based on:
test mat.
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

% Degradation
Parameter:
% degradation (DOC removal)
Value:
96
Sampling time:
22 d
Details on results:
- abiotic elimination control (w/o inoculum, w mercury chloride to avoid microbial degradation): 0 % (22 d)
- adsorption control (w inoculum, w mercury chloride): 0 % (22 d)
- inhibition control (test substance/reference substance: each 20 mg/L DOC): 90 % (22 d)
Kinetic of test substance (in %):
= 0 after 1 day(s)
= 24 after 3 day(s)
= 71 after 7 day(s)
= 94 after 14 day(s)
= 96 after 18 day(s)
Kinetic of control substance (in %):
= 23 after 3 day(s)
= 70 after 7 day(s)

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
readily biodegradable