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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

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Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1976
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
other: Ceiba Geigy Internal Method A-15
Version / remarks:
Comparable to internationally accepted guidelines
Deviations:
no
GLP compliance:
no
Oxygen conditions:
aerobic
Inoculum or test system:
activated sludge (adaptation not specified)
Details on inoculum:
Not available
Initial conc.:
10 mg/L
Based on:
not specified
Details on study design:
None
Preliminary study:
None
Test performance:
None
Remarks on result:
not measured/tested
Details on results:
None
Parameter:
BOD5
Value:
0 mg O2/g test mat.
Results with reference substance:
None
Validity criteria fulfilled:
not specified
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
BOD5 of FAT 20077/B is found to be 0 mg O2/g.
Executive summary:

BOD5 of FAT 20077/B is found to be 0 mg O2/g. Taking the results of the corresponding COD test into account the resulting BSB5/COD quotient is zero indicating that no biodegradation can be expected.

Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1976
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
no guideline followed
Principles of method if other than guideline:
The part of a chemical substance that is able to be oxidized is determined in form of chemical oxygen demand (COD).
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:
No data
Duration of test (contact time):
2 h
Details on study design:
Not available
Preliminary study:
Not available
Test performance:
Not available
Remarks on result:
not measured/tested
Details on results:
No data
Parameter:
COD
Value:
1 102
Validity criteria fulfilled:
not applicable
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
COD of FAT 20077/B was found to be 1102 mg/g O2.
Executive summary:

COD of FAT 20077/B was found to be 1102 mg/g O2. Taking the results of the corresponding BOD test into account the resulting BSB5/COD quotient is zero indicating that no biodegradation can be expected.

Description of key information

FAT 20077/A and FAT 20077/B were tested for the biological oxygen demand and chemical oxygen demand. For FAT 20077/B, the BOD5 and COD were determined to be 0 mg O2/g and 1102 mg/g O2, respectively. For FAT 20077/A, BOD5 and COD were determined to be 42 mg O2/g and 1116 mg/g O2, respectively.

Based on these values, the BOD5/COD ratio was <0.5, therefore the substance is not considered to be rapidly biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information