Reaction Mass of hydrogen bis[4-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzene-1-sulphonato(3-)]ferrate(3-) and trisodium bis[4-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzene-1-sulphonato(3-)]ferrate(3-)

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

GLP compliance:

no

Type of method:

flask method

Water solubility:

ca. 89.42 g/L

Temp.:

20 °C

pH:

ca. 6.74

Remarks on result:

other: pH mother solution = 5.96, pH satured solution = 6.74, Standard deviation ± 0.33

Details on results:

Average solubility after 24, 48 and 96 h at 20°C is 89.42 g/l.

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). Adjusting concentrations in proportion to the real weights, the following results were obtained:

 

test 1 (24 hs)	89.07	g/l
test 2 (48 hs)	89.71	g/l
test 3 (96 hs)	89.47	g/l
average solubility	89.42	g/l
standard deviation	0.33
pH mother solution	5.96
pH satured solution	6.74

Conclusions:

Water solubility at 20°C and pH 6.74 = 89.42 g/l

Executive summary:

Method

OECD guideline 105.

 

Result

Average solubility: 89.42 g/l at 20°C and pH 6.74

Standard deviation: 0.33

Description of key information

Water solubility at 20°C and pH 6.74 = 89.42 g/l

Key value for chemical safety assessment

Water solubility:

89.42 g/L

at the temperature of:

20 °C