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Environmental fate & pathways

Biodegradation in water: screening tests

Administrative data

Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1990
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study followed Guideline, relevant data are given

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1990
Report date:
1990

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
Deviations:
not specified
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
m-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid
EC Number:
204-303-0
EC Name:
m-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid
Cas Number:
119-17-5
Molecular formula:
C10H10N2O4S
IUPAC Name:
3-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzene-1-sulfonic acid

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
other: sludge, mixed from industrial and non-industrial STP 30:70%
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
200 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
DOC removal

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (DOC removal)
Value:
0
Sampling time:
3 h
Parameter:
% degradation (DOC removal)
Value:
15
Sampling time:
28 d

BOD5 / COD results

Results with reference substance:
DEG: 98% removal after 10 days

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Interpretation of results:
not inherently biodegradable
Conclusions:
The test substance is not inherently biodegradable
Executive summary:

The inherent biodegradability of the test item was determined with the Zahn-Wellens-Test (OECD 302B). The total elimination and degradation after 28 days was 15% determined as DOC. No elimination was found after 3 hours.