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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:
25 November, 1993 to 15 December, 1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
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:
Test substance
Code number: FAT - 36'038/F
En-Nr.: 409753.32
Purity 69.4 %
Appearance: solid
Solubility: inslouble
Storage: room temperature
Expiration date: 09/98
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.
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:
yes
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The COD of FAT 36038/F is 1120 mgO2/g.
Executive summary:

The chemical oxygen demand (COD) of FAT 36038/F was determined according to DEV DIN 38'409 - H 41 -1 (1980) corresponding to 92/96/EEC C.6.

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 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

FAT 36038 is not readily biodegradable. 

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed
Type of water:
freshwater

Additional information

The biodegradability of Disperse Violet 057 has been studied in several studies over the years. In the most recent study (1993), the chemical oxygen demand (COD) of FAT 36038/F was determined to be 1120 mg COD/g.

In a study 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 BOD5 and COD values were determined:

FAT 36038/A: BOD5 = 42 mg/g O2, COD = 1293 mg COD/g

FAT 36038/C: BOD5 = 40 mg/g O2, COD = 775 mg COD/g

FAT 36038/D: BOD5 = 190 mg/g O2, COD = 854 mg COD/g

The BOD5/COD quotient was found to be less than 0.5 in each case, therefore, the substance is considered to be not indicative of rapid degradation.

Taking all data into consideration, FAT 36038 is not readily biodegradable.