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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:
From September 21, 2006 to March 19, 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
GLP compliance:
yes
Type of method:
flask method
Specific details on test material used for the study:
Purity 94.4%
Purified active substance obtained via lyophilisation of aqueous solution (batch 667H3002)
Key result
Water solubility:
455 000 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
2 other: g
Incubation duration:
72 h
Remarks on result:
other: in bi-distilled water
Remarks:
at different temperatures and pH
Key result
Water solubility:
444 000 mg/L
Conc. based on:
test mat.
Loading of aqueous phase:
2 other: g
Incubation duration:
72 h
Remarks on result:
other: in buffer solutions
Remarks:
at different temperatures and pH
Details on results:
Stable: yes
Temperature effects: no

Results:
Bi-distilled water: 455000 mg/L (pH around 5.0)
Buffer solution pH 4: 444000 mg/L (pH: 3.81-3.98)
Buffer solution pH 7: 444000 mg/L (pH: 6.70-6.80)
Buffer solution pH 9: 444000 mg/L (pH: 8.11-8.30)

Conclusions:
Under the study conditions, the water solubility of the test substance was determined to be 455000 mg/L in bi-distilled water and 444000 mg/L in buffer solutions and was independent of the temperature and pH.
Executive summary:

A study was conducted to determine the water solubility of the test substance according to OECD Guideline 105, in compliance with GLP. In this experiment, the solubility of the test substance was determined using a modified flask method at 10, 20 and 30°C with a preincubation at 35°C. 2.0 g of the test substance was soluble in 4.5 mL of buffer solutions (pH 4, 7 and 9) and 4.4 mL of  bi-distilled water, respectively. Under the study conditions, the water solubility of the test substance was determined to be 455000 mg/L in bi-distilled water and 444000 mg/L in buffer solutions and was independent of the temperature and pH (Schulze, 2007).

Description of key information

The water solubility was determined according to OECD Guideline 105 (modified flask method) (Schulze, 2007)

Key value for chemical safety assessment

Water solubility:
455 000 mg/L
at the temperature of:
10 °C

Additional information

Solubility was 455000 mg/L in bi-distilled water and 444000 mg/L in buffer solutions (independent of the temperature and pH)