Sodium [3-hydroxy-4-[(1-hydroxy-5-sulpho-2-naphthyl)azo]naphthalene-1-sulphonato(4-)]chromate(1-)

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

biodegradation in water: screening tests

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1982

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

other: Ciba Geigy in house method A-15

Version / remarks:

Comparable to internationally accepted guidelines

GLP compliance:

no

Specific details on test material used for the study:

None

Oxygen conditions:

not specified

Inoculum or test system:

not specified

Details on inoculum:

None

Duration of test (contact time):

5 d

Details on study design:

None

Preliminary study:

None

Test performance:

None

Parameter:

not specified

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:

yes

Interpretation of results:

other: Biological Oxygen Demand (BOD5)

Conclusions:

The BOD5 of FAT 20290/A is 0 mg O2/g.

Executive summary:

The BOD5 (Biological Oxygen Demand) of FAT 20290/A is 0 mg O2/g. Taking the value of the corresponding COD value into account, the respective BOD5/COD quotient is expected to be close to zero.

Reference 2

Endpoint:

biodegradation in water: screening tests

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1982

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

other: Ciba Geigy Internal Method A-16

Version / remarks:

Comparable to internationally accpeted guidelines

Deviations:

no

GLP compliance:

no

Oxygen conditions:

aerobic

Inoculum or test system:

not specified

Details on inoculum:

none

Duration of test (contact time):

h

Details on study design:

None

Preliminary study:

None

Test performance:

None

Parameter:

not specified

Remarks on result:

not measured/tested

Details on results:

None

Parameter:

COD

Value:

1 106.7 mg O2/g test mat.

Results with reference substance:

The COD of Potassium hydrogen phthalate is 198 mg O2/I
(Validity: 200 ± 8 mg 02/l)

None

Validity criteria fulfilled:

yes

Interpretation of results:

other: Chemical Oxygen Demand (COD)

Conclusions:

The COD of FAT 20290/A is 1106.7 mg O2/g.

Executive summary:

The COD (Chemical Oxygen Demand) of the test substance FAT 20290/A is 1106.7 mg O2/g. Taking the value of the corresponding BOD5 value into account, the respective BOD5/COD quotient is expected to be close to zero.

Description of key information

The COD of FAT 20290/A is 1106.7 mg O2/g.
The BOD of FAT 20290/A is 0 mg O2/g.

Key value for chemical safety assessment

Biodegradation in water:

under test conditions no biodegradation observed

Type of water:

freshwater

Additional information

Currently no studies evaluating the ready biodgradability of FAT 20290 are available. However, studies evaluating the Biological Oxygen Demand (BOD5) and Chemical Oxygen Demand for FAT 20290/A were conducted. Based on the outcomes of these studies, the BOD5 and COD of FAT 20290/A were found to be 0 mg O2/g and 1106.7 mg O2/g, respectively. Using these values, the BOD5/COD can't be calculated but is close to 0, therefore, the substance can be considered to be not rapidly biodegradable.