Octasodium 2,2'-[1,4-phenylenebis[imino(6-chloro-1,3,5-triazine-4,2-diyl)imino(1-hydroxy-3,6-disulphonatonaphthalene-2,8-diyl)azo]]bisnaphthalene-1,5-disulphonate

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

The 22th of July, 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The study was conducted in OECD 105 " Water Solubility" adopted 27.07.95.Test conducted according to internationally accepted testing guidelines.

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Version / remarks:

(adopted 27.07.95)

Principles of method if other than guideline:

Extracts were measured in the range 190/800 nm

GLP compliance:

no

Type of method:

flask method

Water solubility:

ca. 411.28 g/L

Temp.:

20 °C

Remarks on result:

other: mean of two measurements

Details on results:

Reference solutions were measured in the spectrophotometer in quantitative mode, thus generating a calibration curve smooth and linear at every concentration.Two measurement were performed, at 24 and after 48 hs. Measured results were the following:Final test at 24h: 409.85 g/LFinal test at 48h: 412.17 g/L

Preliminary solubility test: Reference samples and extract were first measured in the range 190 / 800 nm, so as to choose the right wavelength for quantitative measurements. Wavelength chosen: 288.50 nm.

Conclusions:

Interpretation of results: very soluble (> 10000 mg/L). The tested substance is considered very soluble (water solubility = 411.28 g/L)

Executive summary:

Water solubility was determined by OECD Guideline 105 (Water solubility), adopted 27.05.95.

A preliminary solubility test was performed: a preliminary solution was prepared.

1.5 mL of the saturated solution was taken from this solution and separated by centrifugation. The supernanatant was weighed and dissolved with double distilled water in 100 mL, keeping the solution for 1 h in a thermostatic bath at 20°C, then adjusting volume.

Reference samples and extract were first measured in the range 190 / 800 nm, so as to choose the right wavelength for quantitative measurements. The Wavelength chosen was 288.50 nm.

Two measurements were performed on the final solution, at 24 and after 48 hs.

Final test at 24h: 409.85 g/L

Final test at 48h: 412.71 g/L

The tested substance is considered soluble (water solubility = 411.28 g/L, mean)

Description of key information

411.28 g/L

Key value for chemical safety assessment

Water solubility:

411.28 g/L

at the temperature of:

20 °C

Additional information

Water solubility was determined by OECD Guideline 105 (Water solubility), adopted 27.05.95.

A preliminary solubility test was performed: a preliminary solution was prepared.

1.5 ml of the saturated solution was taken from this solution and separated by centrifugation. The supernanatant was weighed and dissolved with double distilled water in 100 ml, keeping the solution for 1 h in a thermostatic bath at 20 °C, then adjusting volume.

Reference samples and extract were first measured in the range 190 / 800 nm, so as to choose the right wavelength for quantitative measurements. The wavelength chosen was 288.50 nm.

Two measurements were performed on the final solution, at 24 and after 48 hs.

Final test at 24h: 409.85 g/l

Final test at 48h: 412.71 g/l

The tested substance is considered soluble (water solubility = 411.28 g/l, mean)