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Environmental fate & pathways

Biodegradation in water: screening tests

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Endpoint:
biodegradation in water: ready biodegradability
Remarks:
COD
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
other: Ciba Geigy internal Method A-22
Version / remarks:
Comparable to internationally accepted guidelines.
Deviations:
no
GLP compliance:
no
Specific details on test material used for the study:
Name : FAT 40045/C
Purity: 100 %
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Parameter followed for biodegradation estimation:
O2 consumption
Remarks on result:
not measured/tested
Parameter:
COD
Value:
849 mg O2/g test mat.
Validity criteria fulfilled:
not specified
Interpretation of results:
not readily biodegradable
Conclusions:
COD of FAT 40045/C is found to be 849 mg O2/g.
Executive summary:

COD of FAT 40045/C was determined according to CIBA -GEIGY internal method. Based on the findings of the study, the COD of test substance was found to be 849 mg O2/g. Considering the BOD5 value determined with the test substance (11 mg/ gO2), the resulting BOD5/COD quotient is 0.01, indicating that the test substance is unlikely to be biodegradable.

Endpoint:
biodegradation in water: inherent biodegradability
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
Version / remarks:
Comparable to internationally accepted guidelines.
GLP compliance:
no
Specific details on test material used for the study:
Name : FAT 40045/C
Purity: 100 %
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
28 d
Initial conc.:
155 mg/L
Based on:
DOC
Parameter followed for biodegradation estimation:
DOC removal
Preliminary study:
none
Test performance:
none
Parameter:
% degradation (DOC removal)
Value:
14
Sampling time:
28 d
Remarks on result:
other: std deviation specified
Validity criteria fulfilled:
no
Interpretation of results:
not inherently biodegradable
Conclusions:
The DOC removal was 14 %. Hence, FAT 40045/C was concluded to be not inherently biodegradable.
Executive summary:

The inherent biodegradability of FAT 40045/C was determined according to in-house Ciba Geigy Methode A.37 (Zahn wellens test). Based on the findings of the study, the DOC removal was 14 %. Hence, FAT 40045/C was concluded to be not inherently biodegradable.

Endpoint:
biodegradation in water: ready biodegradability
Remarks:
BOD5
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1987
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
according to
Guideline:
other: Ciba Geigy internal Method A-15
Version / remarks:
Comparable to internationally accepted guidelines.
Deviations:
no
GLP compliance:
no
Specific details on test material used for the study:
Name: FAT 40045/C
Purity: 100 %
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Duration of test (contact time):
5 d
Initial conc.:
500 mg/L
Parameter followed for biodegradation estimation:
O2 consumption
Remarks on result:
not measured/tested
Parameter:
BOD5
Value:
11 mg O2/g test mat.
Validity criteria fulfilled:
no
Interpretation of results:
not readily biodegradable
Conclusions:
BOD5 of FAT 40045/C is found to be 11 mg O2/g.
Executive summary:

BOD5 of FAT 40045/C was determined according to in house Ciba Geigy Methode A.15, which is comparable to internationally accepted guidelines. Based on these investigations, the BOD5 of test substance was found to be 11 mg O2/g. Considering the COD value determined with the test substance which is 849 mg O2/g, the resulting BOD5/COD quotient is 0.01, indicating that the test substance is not readily biodegradable.

Description of key information

A study was conducted to evaluate the biodegradation potential of the test substance (of 100 % purity) via BOD5 and COD determination. The ratio of these values was equivalent to 0.01, indicating that the substance showed low biodegradation potential under the study conditions. In another study, activated sludge was exposed at the equivalent of 155 mg test substance DOC/L for 28 d and DOC removal was followed. Under the study conditions, elimination was equivalent to 14 %, suggesting that the test substance was not inherently biodegradable. Based on these results, the test item FAT 40045 is considered as not biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information