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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
11/10/97 - 1/15/98
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
The study was performed fully compliant with the requirements of the OECD301B Guidline and according to GLP principles. When used to evaluate the test material, the study is considered reliable without restrictions according to the criteria of Klimisch, 1997. However, when used for read-across to a similar material, the reliability is reduced to reliable with restrictions according to the Klimisch criteria.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1998
Report date:
1998

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
calcium di(alkyl(C20-C24, even numbered)(branched)-methylbenzenesulfonate containing Distillates (petroleum), hydrotreated heavy paraffinic
Cas Number:
722503-68-6
Molecular formula:
CaS2O6(C54-62)(H94-110)
IUPAC Name:
calcium di(alkyl(C20-C24, even numbered)(branched)-methylbenzenesulfonate containing Distillates (petroleum), hydrotreated heavy paraffinic

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
mixture of sewage, soil and natural water
Duration of test (contact time):
ca. 28 d
Initial test substance concentration
Initial conc.:
10 mg/L
Based on:
formulation
Parameter followed for biodegradation estimation
Parameter followed for biodegradation estimation:
O2 consumption
Reference substance
Reference substance:
other: Canola Oil

Results and discussion

Preliminary study:
See study report for details
Test performance:
See study report for details
% Degradation
Parameter:
% degradation (O2 consumption)
Value:
12.5
Sampling time:
28 d

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
12.5% theoretical CO2 evolved; material not readily biodegradeable