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Environmental fate & pathways

Biodegradation in water: screening tests

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Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
None
Qualifier:
according to guideline
Guideline:
other: CIBA Method A-37
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
Principles of method if other than guideline:
None
GLP compliance:
no
Specific details on test material used for the study:
None
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
Activated sludge should be taken from a municipal waste water treatment plant which has been rinsed with municipal water for 2 times. The sediment is taken to estimate the dry weight according to method A-26. The activated sludge is prepared one day before the start of the experiment, ventilated overnight and adjusted to a concentration of 600 mg/L.
Duration of test (contact time):
28 d
Details on study design:
None
Preliminary study:
None
Test performance:
None
Key result
Parameter:
% degradation (DOC removal)
Value:
8
Remarks on result:
other: not inherently biodegradable
Details on results:
None
Results with reference substance:
None

None

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
Biodegradation of the test substance after 28 days was 8 %.
Executive summary:

The inherent biodegradability of FAT 40034/D was determined in a Zahn-Wellens test. The bio-elimination of FAT 40032/D was found to be 8 % (DOC).

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
according to guideline
Guideline:
other: CIBA Method A-15
Principles of method if other than guideline:
None
GLP compliance:
no
Specific details on test material used for the study:
None
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
None
Duration of test (contact time):
5 d
Details on study design:
None
Preliminary study:
None
Test performance:
None
Remarks on result:
other: BOD5 was determined
Details on results:
None
Key result
Parameter:
BOD5
Value:
13 mg O2/g test mat.
Results with reference substance:
None

None

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The BOD of FAT 40032/D is: 13 mg O2/g test mat.
Executive summary:

The biochemical oxygen demand of FAT 40032/D is determined by measuring the dissolved oxygen concentration before and after 5 days incubation at 20 °C in different test concentrations diluted in water saturated with dissolved oxygen that contains a seed of microorganisms. The test was carried out according to CIBA Method A-15. The BOD5 of FAT 40032/D is 13 mg O2/g test material.

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
None
Qualifier:
according to guideline
Guideline:
other: CIBA Method A-22
Principles of method if other than guideline:
None
GLP compliance:
no
Specific details on test material used for the study:
None
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
None
Duration of test (contact time):
5 d
Details on study design:
None
Preliminary study:
None
Test performance:
None
Remarks on result:
other: COD was determined
Details on results:
None
Key result
Parameter:
COD
Value:
935 mg O2/g test mat.
Results with reference substance:
None

None

Validity criteria fulfilled:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The COD of the test substance FAT 40032/D is: 935 mg O2/g.
Executive summary:

A study was performed to determine the chemical oxygen demand of FAT 40032/D according CIBA Method A-22. The COD of FAT 40032/D is 935 mg O2/g

Description of key information

FAT 40032 is not readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The key study was performed to determine the percent biodegradation of FAT 40032/D. The biological elimination of FAT 40032/D is found to be 8 %. The chemical oxygen demand of FAT 40032/D was found to be 935 mg O2/g test material whereas the biological oxygen demand was found to be 13 mg O2/g test material.

Several other key studies showed the following results:

COD of 906.3 mg O2/g test material.

BOD5 of 0 mg O2/g test material.

COD of 247.41 mg O2/g test material.

COD of 649.74 mg O2/g test material.

The relevant BOD5/COD quotient is <0.5, therefore the substance is not indicative of rapid degradation.

Taking into consideration the data from key study and supporting studies, the test substance FAT 40032 is not biodegradable.