Tetrasodium tripotassium (.my.-((2,2'-((3-imino-6-sulfonatophenyl-(N-methyl)-imino)bis((6-chloro-1,3,5-triazin-4,2-diyl)imino(2-hydroxy-5-sulfonato-3,1-phenylen)azo(phenylmethylen)azo))bis(4-sulfonatobenzoato))-dicuprate(7-)

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

May/June 1989

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

GLP compliance:

yes

Type of method:

flask method

Key result

Water solubility:

<= 93 g/L

Conc. based on:

test mat. (dissolved fraction)

Incubation duration:

24 h

Temp.:

24 °C

pH:

8

Conclusions:

The substance is fully soluble up to 93 g/L in pure water.

Executive summary:

A study was conducted to determine the water solubility of the test substance according to EU Method A.6, in compliance with GLP. The substance was weighted into distilled water and mixed for a minimum of 24 h. The aqueous solution was then centrifuged for 60 min at 24°C and filtered under pressure. The centrifuge glass was checked visually after decanting and the filter surface was checked at the end of the filtration process. The analytical method used was UV spectrometry. As a result of the high concentration of chloralkali in the test substance, a “salting-out" effect was observed at higher weighed-in concentrations. This resulted in a decrease in the dye concentrations in the aqueous phase, at higher test substance concentrations. The substance is fully soluble up to 93 g/L in pure water

. The saturated solution had a pH of 8 (Böck, 1989).

Description of key information

The water solubility was determined according to EU Method A.6 (Böck, 1989).

The substance is fully soluble up to 93 g/L in pure water.

Key value for chemical safety assessment

Water solubility:

93 g/L

at the temperature of:

24 °C