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:
1992-12-08 to 1993-01-05
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: According to guideline OECD 301E but Tox-control is missing. Toxicity to microorganisms according to guideline OECD 209: EC50 > 1000 mg/l

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1993
Report Date:
1993

Materials and methods

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

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
sewage, predominantly domestic, non-adapted
Details on inoculum:
- Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): local STP Frankfurt-Sindlingen
- Pretreatment: filtered (folded filter)
- Concentration of sludge: 0.5 ml/l
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
35.4 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
DOC removal
Reference substance
Reference substance:
benzoic acid, sodium salt

Results and discussion

% Degradation
Parameter:
% degradation (DOC removal)
Value:
18.1
Sampling time:
28 d

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Executive summary:

18.1 % biodegradation under test conditions: not readily biodegradable