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Water solubility

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water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 2009-01-28 to 2009-05-06
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
The study was conducted according to an internationally recognised method, and under GLP. No deviation affected the good quality of the study. The substance is considered to be adequately characterised with its purity. Therefore full validation applies.
according to
OECD Guideline 105 (Water Solubility)
according to
EU Method A.6 (Water Solubility)
GLP compliance:
yes (incl. certificate)
Inspected on 05th to 06th and 26th to 30th November 2007 / Decision 30 April 2008 / Signed on 12th November 2008
Type of method:
column elution method
Key result
Water solubility:
1.88 mg/L
Conc. based on:
test mat. (dissolved fraction)
Incubation duration:
95 h
20 °C

During the main test, six samples have been analyzed in the first run (0.52 mL/min) and six samples during the second run (0.26 mL/min), each with a sampling interval of one hour. Total elution time was 95 hours. The sample measurement was performed by GC. The water solubility at 20 °C was determined to be 1.88 mg/L. The measured results differ by less than 30%. Therefore, the study is considered to be valid.

Experiment No. Flow rate [mL/h] Sample No. Concentration analyzed [mg/L] Water solubility [mg/L] pH
1 31 1 1.793 1.849
SD +/- 0.08
SDrel = 4.43%
1.88 6.50
2 1.857 6.49
3 1.837 6.51
4 1.731 6.51
5 1.919 6.52
6 1.956 6.50
2 16 7 1.942 1.906
SD +/- 0.07
SDrel = 3.93%
8 1.881 6.49
9 2.012 6.52
10 1.791 6.50
11 1.875 6.51
12 1.933 6.51

SD = Standard Deviation

SD rel. = Relative Standard Deviation

The r² fit of the calibration curve (n=6) was 1.0000. This reflects the linearity of the GC-system within the calibration range of 0.3235 mg/L to 16.175 mg/L of the test item.

Executive summary:

The water solubility of the test substance was measured under GLP according OECD 105 / EU A6 guideline, column elution method.

After calibration with six standard solutions, two experiments were conducted, with different flow rate, for 95h total elution time. Constant concentrations, measured by GC-FID, were observed, i.e. saturation achieved, and both results did not significantly differ, therefore the mean value was retained. pH was stable for all samples.

The water solubility of the test substance is 1.88 mg/L at 20°C (pH=6.5).

Description of key information

Slightly soluble. pH of saturated solution: 6.5.

Key value for chemical safety assessment

Water solubility:
1.88 mg/L
at the temperature of:
20 °C

Additional information

A fully reliable study, conducted according to a recognized OECD/EU method and under GLP, is available. It is considered as a key study, and the result is retained as key data for purpose of CSA.