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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:
2010-04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 1
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
GLP compliance:
no
Type of method:
flask method
Test material information:
Composition 1
Water solubility:
ca. 0.8 mg/L
Temp.:
25 °C
pH:
ca. 6.24
Remarks on result:
other: The pH of the aqueous solutions was measured after completion of the tests.
Details on results:
Test 2, 3, 4 and 5 were treated similarly after initial equilibration at 300°C + 10°C for two, three, four and five days respectively.

Triplicate results were obtained (< 15%) with tests 1, 2 and 3 with no evidence of increasing solubility from tests 4 and 5.

The pH of the aqueous solutions was measured after completion of the tests.


Individual results

Test Water Solubility mg/l pH of solution
1 0.78 5.71
2 0.80 5.58
3 0.88 6.24
4 0.95 6.43
5 0.71 6.49
Water blank N/A 6.85

Due to expected low water solubility (<10 mg/L) as indicated during surface tension analysis, the column elution method was initially proposed as the most suitable method for analysis. An attempt was made to prepare the free flowing coated support material required for this test but due to the nature of the test substance, this was not possible. The expected water solubility was therefore lower than the recommended limit for shake flask testing, however the sensitivity of the HPLC method used was such that it was expected that adequate accuracy of the test solutions could be obtained at the low levels required and therefore the shake flask procedure was used.

Conclusions:
The water solubility of the test substance was 0.8 mg/L at 25°C.
Executive summary:

The water solubility of the test substance was investigated using shake flask method in accordance with EU guideline A6. Using this method the water solubility of the test substance was determined to be 0.8 mg/L at 25°C.

Description of key information

The water solubility of Isopentyl p-methoxycinnamate was 0.8 mg/L at 25°C.

Key value for chemical safety assessment

Water solubility:
0.8 mg/L
at the temperature of:
25 °C

Additional information

The water solubility of Isopentyl p-methoxycinnamate was determined by quantitative HPLC analysis according to EU method A6 (shake flask method).

Due to expected low water solubility (<10 mg/L) as indicated during surface tension analysis, the column elution method was initially proposed as the most suitable method for analysis. An attempt was made to prepare the free flowing coated support material required for this test but due to the nature of the test substance, this was not possible. The expected water solubility was therefore lower than the recommended limit for shake flask testing, however the sensitivity of the HPLC method used was such that it was expected that adequate accuracy of the test solutions could be obtained at the low levels required and therefore the shake flask procedure was used. The water solubility of test substance in the 5 test solutions ranged from 0.71 to 0.95 mg/L (mean: 0.8 mg/L), as determined by quantitative HPLC analysis. The pH values of the test solutions ranged from 5.58 to 6.85.