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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

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:
1988
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: according to Zahn-Wellens test (only test results reported)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1988
Report date:
1988

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method C.9 (Biodegradation: Zahn-Wellens Test)
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
3-methyl-1-p-tolyl-5-pyrazolone
EC Number:
201-708-4
EC Name:
3-methyl-1-p-tolyl-5-pyrazolone
Cas Number:
86-92-0
Molecular formula:
C11H12N2O
IUPAC Name:
3-methyl-1-p-tolyl-5-pyrazolone

Study design

Oxygen conditions:
not specified
Inoculum or test system:
not specified
Details on inoculum:
no further detailed information reported about inoculum used for this Zahn Wellens test
Duration of test (contact time):
28 d
Initial test substance concentrationopen allclose all
Initial conc.:
394 other: mgC/L
Based on:
DOC
Initial conc.:
1 542 other: mgO2/L
Based on:
COD
Reference substance
Reference substance:
not specified

Results and discussion

% Degradationopen allclose all
Parameter:
% degradation (DOC removal)
Value:
0
Sampling time:
3 h
Parameter:
% degradation (DOC removal)
Value:
5
Sampling time:
5 d
Parameter:
% degradation (DOC removal)
Value:
0
Sampling time:
10 d
Parameter:
% degradation (DOC removal)
Value:
8
Sampling time:
15 d
Parameter:
% degradation (DOC removal)
Value:
30
Sampling time:
28 d

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Interpretation of results:
other: hardly to moderately biodegradable
Conclusions:
The tested substance is hardly to moderately biodegradable.
Executive summary:

A biodegradation range of 30 -70% is possible since after 15d of adaption a clear biodegradation started; biodegradation could possibly be higher if the test was based on an adapted inoculum