Sodium bis[2,4-dihydro-4-[(2-hydroxy-4-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)]chromate(1-)

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

GLP compliance:

no

Type of method:

flask method

Water solubility:

26.96 g/L

Conc. based on:

test mat.

Temp.:

20 °C

pH:

ca. 7.71

Test 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). Due to the significant decrement of Test 3’s concentration at 96 hs, only test 1 and test 2 were considered for the average solubility. Adjusting concentrations in proportion to the real weights the following results were obtained:

test 1 (24 hs)	26.84	g/l
test 2 (48 hs)	27.08	g/l
average solubility	26.96	g/l
standard deviation	0.12
test 3 (96 hs)	7.09	g/l
pH mother solution	6.42
pH satured solution	7.71

Conclusions:

Under test conditions, the substance resulted as very soluble in water.

Executive summary:

Method

Solubility test was performed following OECD guideline 105.

Result

Average water solubility was 26.96 g/l at 20 °C and pH 7.71.

Description of key information

Not soluble at 20 °C and pH 6.21.

Additional information

Water solubility according to OECD guideline 105.