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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: screening tests
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
other: DEV DIN 38'49-H-41-1 (1980) corresponding to 92/96/EEC C.6.
Deviations:
yes
Remarks:
Mean of 2 determinations instead of 3.
GLP compliance:
yes
Specific details on test material used for the study:
None
Oxygen conditions:
aerobic
Inoculum or test system:
other: no applicable
Details on inoculum:
Not applicable
Duration of test (contact time):
2 h
Details on study design:
- Experimental conditions:
- Sample weight: 5.47 + 5.70 mg of the test substance
- Temperature: 148 ± 3 °C
- Duration: 2 hours
- Estimation Technique: Titration (Potentiometrie), METROHM Titroprozessor 670 (SAV : 00 111)

Reference substance:
other: Potassium hydrogen phtalate solution (merck-Nr.11 769)
Preliminary study:
None
Test performance:
None
Remarks on result:
not measured/tested
Details on results:
The COD of FAT 36038/F is 1120 mg O2/g.
The COD of the reference substance is 196 mg O2/I.
Parameter:
COD
Value:
1 120 mg O2/g test mat.
Results with reference substance:
The COD of Potassium hydrogen phthalate is 196 mg O2/l.
(Validity: 200 ± 8 mg O2/l)
Validity criteria fulfilled:
not applicable
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The COD of FAT 36038/F is 1120 mgO2/g.
Executive summary:

A predetermined amount of the test substance FAT 36038/F in water is oxidized by potassium dichromate in a strong sulphuric acid medium with silver sulphate as a catalyst under reflux for 2 hours. The residual dichromate is determined by titration with standardized ferrous ammonium sulphate.

The test was carried out according to DEV DIN 38'409 - H 41-1 (1980) corresponding to 92/96/EEC C.6.

The test was performed in compliance with the Good Laboratory Practice (GLP) Regulations of Switzerland.

The test substance was tested with a sample weight of 5.47 + 5.70 mg. The reference substance Potassium hydrogen phthalate solution was tested in a concentration of 20 ml/l.

Result:

The COD of FAT 36038/F is 1120 mg O2/g.

The COD of the reference substance is 196 mg O2/I.

Description of key information

The test substance FAT 36038 is not biodegradable. 

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

A key study was carried out to determine chemical oxygen demand of FAT 36038/F.The COD of FAT 36038/F is 1120 mg COD/g.

A study was performed to determine the biological elimination of FAT 36038/C according to a guideline which is equivalent or similar to OECD test guideline 303 A (confirmatory test). At the end of 28 days, the biological elimination of FAT 36038/C was found to be 98 % (TOC removal).

In several supporting studies, following BOD and COD values were found:

BOD: 42, 40, 190 mg/g O2;

COD: 1293, 775, 854 mg COD/g.

Relevant is the BOD5/COD quotient which is less than 0.5, therefore, the substance is not indicative of rapid degradation.

Taking all data into consideration, the test substance FAT 36038 is not biodegradable.