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Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1995
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1995
Report Date:
1995

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
Principles of method if other than guideline:
None
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Specific details on test material used for the study:
None

Study design

Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
Activated sludge of a communal sewage treatment plant Ara Reinach collected on 01.11.94
Duration of test (contact time):
28 d
Initial test substance concentration
Initial conc.:
150 mg/L
Based on:
DOC
Details on study design:
Experimental conditionsWater / Nutrient: according to the specifications of the OECD guidelineTemperature: 20 - 25 °C (room temperature)Test duration: 28 daysLighting: indirect daylightEstimation Technique: TOC/DOC Analyzer 500
Reference substance
Reference substance:
diethylene glycol

Results and discussion

Preliminary study:
None
Test performance:
None
% Degradation
Key result
Parameter:
% degradation (DOC removal)
Value:
4
Sampling time:
28 d
Remarks on result:
other: Standard deviation not available
Details on results:
None

BOD5 / COD results

Results with reference substance:
The biodegradation of the reference substance after 8 days was: 98 %

Any other information on results incl. tables

None

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
Biodegradation of the test substance after 28 days was 4 %.
Executive summary:

A key study was performed to determine the percent biodegradation of FAT 40170. An inherent biodegradability of FAT 40170 was determined in a modified Zahn-Wellens - Test according to the OECD Guideline for Testing of Chemicals, No. 302B, 1992. The test substance was tested in a concentration of 150 mg/l. The reference substance (Diethylene glycol) was tested in a concentration of 150 mg/l. Based on the results of the study, biodegradation of the test substance after 28 days was 4 %.