Chromate(2-), [5-(diethylamino)-2-[(2-hydroxy-4-nitrophenyl)azo]phenolato(2-)][5-hydroxy-6-[(2-hydroxy-4-nitrophenyl)azo]-1-naphthalenesulfonato(3-)]-, sodium

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April 30, 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

not specified

GLP compliance:

no

Type of method:

flask method

Water solubility:

ca. 5 700 mg/L

Temp.:

20 °C

pH:

ca. 5.95

Remarks on result:

other: pH on the saturated solution is 6.82

Details on results:

Reference solutions were measured in the spectrophotometer in quantitative mode, thus generating a calibration curve. Calibration curve was smooth and linear at every concentration. Considering that preliminary test resulted in an absorbance keeping the same shape like the references, its value was considered for the 24 hours’ measurement.

Test 1 (24 hs)	5.23	g/l
Test 2 (48 hs)	6.06	g/l
Test 3 (96 hs)	5.81	g/l
Average solubility	5.70	g/l
Standard deviation	0.43
pH mother solution	5.95
pH saturated solution	6.82

Conclusions:

The water solubility of the tested substance is 5700 mg/l at 20 °C.

Executive summary:

Method:

The substance has been tested for water solubility according to the flask method as reported in the OECD guideline 105.

Results:

The water solubility of the substance is 5700 mg/l. The substance is soluble in water.

Description of key information

5700 mg/l

Key value for chemical safety assessment

Water solubility:

5 700 mg/L

at the temperature of:

20 °C

Additional information

OECD guideline 105.