A mixture of: disodium 6-[3-carboxy-4,5-dihydro-5-oxo-4-sulfonatophenyl)pyrazolin-4-yl-azo]-3-[2-oxido-4-(ethensulfonyl)-5-methoxyphenylazo]-4-oxidonaphthalene-2-sulfonate copper (II) complex; disodium 6-[3-carboxy-4,5-dihydro-5-oxo-4-sulfonatophenyl)pyrazolin-4-yl-azo]-3-[2-oxido-4-(2-hydroxyethylsulfonyl)-5-methoxyphenylazo]-4-oxidonaphthalene-2-sulfonate copper (II) complex

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

30 January 1996 to 14 February 1996

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1996

Report date:

1996

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

A mixture of: disodium 6-[3-carboxy-4,5-dihydro-5-oxo-4-sulfonatophenyl)pyrazolin-4-yl-azo]-3-[2-oxido-4-(ethensulfonyl)-5-methoxyphenylazo]-4-oxidonaphthalene-2-sulfonate copper (II) complex; disodium 6-[3-carboxy-4,5-dihydro-5-oxo-4-sulfonatophenyl)pyrazolin-4-yl-azo]-3-[2-oxido-4-(2-hydroxyethylsulfonyl)-5-methoxyphenylazo]-4-oxidonaphthalene-2-sulfonate copper (II) complex;

EC Number:

423-940-7

EC Name:

A mixture of: disodium 6-[3-carboxy-4,5-dihydro-5-oxo-4-sulfonatophenyl)pyrazolin-4-yl-azo]-3-[2-oxido-4-(ethensulfonyl)-5-methoxyphenylazo]-4-oxidonaphthalene-2-sulfonate copper (II) complex; disodium 6-[3-carboxy-4,5-dihydro-5-oxo-4-sulfonatophenyl)pyrazolin-4-yl-azo]-3-[2-oxido-4-(2-hydroxyethylsulfonyl)-5-methoxyphenylazo]-4-oxidonaphthalene-2-sulfonate copper (II) complex;

Cas Number:

85585-91-7

IUPAC Name:

4-[2-(7-{2-[4-(ethenesulfonyl)-2-hydroxy-5-methoxyphenyl]diazen-1-yl}-8-hydroxy-6-sulfonaphthalen-2-yl)diazen-1-yl]-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid 4-[2-(8-hydroxy-7-{2-[2-hydroxy-4-(2-hydroxyethanesulfonyl)-5-methoxyphenyl]diazen-1-yl}-6-sulfonaphthalen-2-yl)diazen-1-yl]-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid dicopper tetrasodium hydride

Test material form:

solid

Specific details on test material used for the study:

Identification: Pacified Reactive Black 31
Description: Dark blue crystals
Batch: 9T-55
Purity: 89%
Storage: At room temperature in the dark
Stability under storage conditions: Stable

Results and discussion

Water solubility

Key result

Water solubility:

> 560 g/L

Conc. based on:

test mat.

Temp.:

20 °C

pH:

ca. 7

Details on results:

Preliminary test
The water solubility estimated from the preliminary test was >560 g/l. The actual concentration was >95% of the nominal concentration. Thus, almost all the test substance was dissolved.

No significant differences were observed between the concentrations analysed after the first and second centrifugation step.

The test substance / water mixture from the preliminary test was very viscous. It is to be expected that the viscosity of the mixture will increase even further, when more test substance is added.

Probably the viscosity will then become so high that stirring of the mixture is no longer possible.

For this reason, no further tests were conducted. Because it was not possible to stir a more concentrated solution the main study was not performed.

Applicant's summary and conclusion

Conclusions:

The test substance / water mixture from the preliminary test was very viscous. It is to be expected that the viscosity of the mixture will increase even further, when more test substance is added.

Probably the viscosity will then become so high that stirring of the mixture is no longer possible.

For this reason, no further tests were conducted. Because it was not possible to stir a more concentrated solution the main study was not performed.

Executive summary:

The determination of the water solubility was based on the following guidelines:

OECD Guideline for the Testing of Chemicals No.105: "Water solubility (column elution method - flask method)", adopted May 12, 1981.

EEC Directive 92/69 EEC, Part A, Methods for the determination of physico-chemical properties, A.6: "Water solubility". EEC Publication no. L383, December 1992.

The water solubility from the preliminary test was >560 g/l. The actual concentration was >95% of the nominal concentration. Thus almost all of the test substance was dissolved.

No significant differences were observed between the concentrations analysed after the first and second centrifugation steps.

The test substance / water mixture from the preliminary test was very viscous. It is to be expected, that the viscosity of the mixture will increase even further, when more test substance is added.

Probably, the viscosity will then become so high, that stirring of the mixture is no longer possible.

For this reason, no further tests were conducted. Because it was not possible to stir a more concentrated solution the main study was not perfomed.