Sodium [5-chloro-3-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulphophenyl)-1H-pyrazol-4-yl]azo]-2-hydroxybenzenesulphonato(4-)]chromate(1-)

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1981

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

equivalent or similar to guideline

Guideline:

other: A15 (Huntsman internal standard guideline)

Deviations:

not specified

GLP compliance:

no

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge (adaptation not specified)

Duration of test (contact time):

5 d

Parameter followed for biodegradation estimation:

O2 consumption

Remarks on result:

not measured/tested

Details on results:

None

Parameter:

BOD5

Value:

ca. 0 mg O2/g test mat.

Validity criteria fulfilled:

not specified

Interpretation of results:

under test conditions no biodegradation observed

Conclusions:

The BOD of FAT 20043/C is 0 mg O2/g test mat.

Executive summary:

The biochemical oxygen demand of FAT 20043/C 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 micro-organisms. The BOD of FAT 20043/C is 0 mg O2/g test mat.

Reference 2

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1981

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: DEV H4 - Methode

Deviations:

no

Principles of method if other than guideline:

None

GLP compliance:

no

Oxygen conditions:

other: not required as COD is being determined

Inoculum or test system:

not specified

Duration of test (contact time):

2 h

Details on study design:

None

Remarks on result:

not measured/tested

Parameter:

COD

Value:

ca. 675 mg O2/g test mat.

Validity criteria fulfilled:

not specified

Interpretation of results:

other: COD is determined

Conclusions:

The COD of FAT 20043/C is 675 mg O2/g test mat.

Executive summary:

The study describes the experimental techniques and the results obtained in a COD test of FAT 36034/D. The study was performed in accordance with DEV H4 - Method. The COD of FAT 20043/C is 675 mg O2/g test mat.

Description of key information

A study was carried out to determine the ready biodegradation of FAT 20043. The biochemical oxygen demand of FAT 20043/C was 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 micro-organisms. The BOD5 and COD of FAT 20043/C was found to be 0 mg O2/g and 675 mg O2/g, respectively.

In another supporting study, the values were as follows:

BOD5 = 2.8 mg/g O2

COD = 335.34 mg/g O2

Relevant is the BOD5/COD quotient which is not >0.5, therefore the substance is not indicative of rapid degradation. Taking the data from key study and supporting studies ino account, the test substance FAT 20043 can be regarded as not biodegradable.

 

Key value for chemical safety assessment

Biodegradation in water:

under test conditions no biodegradation observed