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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
flask method
Water solubility:
> 143 g/L
Temp.:
20 °C
Remarks on result:
other: The pH value could not be determined with a membrane-electrode and also not visual with a pH-Indicator strip.
Details on results:
The water solubility of the substance calculated using carbon content was > 143 g/L. A saturated solution (solution with residue) of the substance could not be prepared because the test mixture changed to a gelatinous substance during the stirring process. Therefore a main test of the water solubility of the substance could not be performed.

Results of the water solubility of preliminary test:

 Test at 20°C

 Preliminary

test 1

Preliminary

test 2

Preliminary

test 3 

 Preliminary

test 4

 Preliminary test 5
 Initial weight of Nigrosin WLF in g  1.53  2.25  3.00  3.80  3.02
 Volume of demineralised water in mL  15  15  15  15  10
 Appearence of the mixture  Dark solution   Dark solution   Dark solution  Gelatinous solution  Gelatinous solution
 Water solubility of the substance (calculated using carbon content)  73.9 g/L  108.9 g/L 142.8 g/L   ----  ----
 pH value pH value could neither be determined with a membrane-electrode nor visual with a pH-Indicator strip       
Conclusions:
Interpretation of results (migrated information): very soluble (> 10000 mg/L)
The water solubility of the substance is > 143 g/L at 20°C. A determination at a higher concentration could not be performed as the substance turned to a gelatinous mass.
Executive summary:

According to the OECD Guideline 105 the water solubility was determined via the flask method. In preliminary tests a water solubility of > 143 g/L at 20°C was received. Due to the fact that usually no standard compounds are available for UVCB substances TOC analysis was performed. A saturated solution could not be received because the test mixture changed to a gelatinous substance during the stirring process. Therefore a main test of the water solubility for the substance could not be performed.

Description of key information

The water solubility of the substance is > 143 g/L at 20°C. A determination at a higher concentration could not be performed as the test mixture turned to a gelatinous mass.

Key value for chemical safety assessment

Water solubility:
143 g/L
at the temperature of:
20 °C

Additional information

"should read: > 143 g/L at 20°C"

According to the OECD Guideline 105 the water solubility was determined via the flask method. In preliminary tests a water solubility of > 143 g/L at 20°C was received. Due to the fact that usually no standard compounds are available for UVCB substances TOC analysis was performed. A saturated solution could not be received because the test mixture changed to a gelatinous substance during the stirring process. Therefore a main test of the water solubility for the substance could not be performed.