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Solubility in organic solvents / fat solubility

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Reference
Endpoint:
solubility in organic solvents / fat solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
August 17, 2011 - January 10, 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
other: Organization for Economic Co-operation and Development (OECD), OECD Guidelines for the Testing of Chemicals no. 105: "Water Solubility", July 27, 1995.
Deviations:
no
Qualifier:
according to
Guideline:
other: European Community (EC), EC no. 440/2008, Part A: Methods for the Determination of Physico-Chemical Properties, Guideline A.6: “Water Solubility”, Official Journal of the European Union no. L142, May 31, 2008.
Deviations:
no
GLP compliance:
yes (incl. certificate)
Key result
Medium:
n-octanol
Solubility:
< 1.08 other: g solids/L
Temp.:
20 °C
Remarks on result:
other: Result expressed for the substance, based on the presence of undissolved test substance at all concentrations (visual determination).
Key result
Medium:
n-octanol
Solubility:
> 783 other: g surfactant part/L
Temp.:
20 °C
Remarks on result:
other: Result expressed for the surfactant part of the substance (analytical determination).
Test substance stable:
not determined

- All the concentrations contained undissolved material

- The undissolved materials from the samples were removed after two centrifuge steps and, therefore, these concentrations were reported

- The results based on the analytical response of the amphoacetate/surfactant part of the test substance are:

Nominal concentration

[g solids/L]

Analysed concentration

[g solids/L]

[g actives/L]

1.08

5.11 x 10-1

4.00 x 10-1

10.2

8.64

6.77

101

8.64 x 101

6.76 x 101

1070

1.28 x 103

9.99 x 102

Note: actives part of the substance is the surfactant part of the substance

Conclusions:
The n-octanol solubility of the surfactant part of the substance was analytically determined to be > 783 g/L. The undissolved particles observed at all concentrations in the study most probably therefore derive from sodium chloride. The n-octanol solubility of the substance was visually determined to be < 1.08 g/L.
Executive summary:

The n-octanol solubility of the substance was investigated. Based on experimental information obtained with a comparable substance (amphoacetates C8-C18), it was decided to analytically determine the n-octanol solubility of the surfactant part of the substance, to investigate whether it would be possible to obtain more information about the logKow of the substance, based on the n-octanol solubility of only the surfactant part of the substance.

The n-octanol solubility of the surfactant part of the substance was analytically determined to be > 783 g/L. The undissolved particles observed at all concentrations in the study most probably therefore derive from sodium chloride. The n-octanol solubility of the substance was visually determined to be < 1.08 g/L. It can therefore be concluded that using the estimation method it is not possible to determine the logKow of (only the surfactant part of) the substance.

Description of key information

The n-octanol solubility of the surfactant part of the substance was analytically determined to be > 783 g/L. The undissolved particles observed at all concentrations in the study most probably therefore derive from sodium chloride. The n-octanol solubility of the substance was visually determined to be < 1.08 g/L.

Key value for chemical safety assessment

Additional information

Based on experimental information obtained with a comparable substance (amphoacetates C8-C18), it was decided to analytically determine the n-octanol solubility of the surfactant part of the substance, to investigate whether it would be possible to obtain more information about the log Kow of the substance, based on the n-octanol solubility of only the surfactant part of the substance. The study was performed in accordance with OECD 105, EU Method A.6 and GLP.