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Physical & Chemical properties

Water solubility

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Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Qualifier:
according to guideline
Guideline:
other: lSO-standard n°304- 1985
GLP compliance:
not specified
Type of method:
other: tensiometry
Key result
Water solubility:
2.991 g/L
Temp.:
20 °C
Remarks on result:
other: pH value was not determined
Details on results:
CMC (water solubility) at 20°C in water: 2.991 +/- 0.446 g/L

According to the Guidance on information requirements and chemical safety assessment, chapter R.7a, pp 77 and 107, it is prudent to take the critical micelle concentration (CMC) as a solubility limit.

Water solubility is measured by tensiometry, a classical method to determine the CMC of a surfactant.

Conclusions:
As the test item is a surfactant, the critical micelle concentration (CMC) is considered as a solubility limit in water; the CMC (water solubilty) at 20 °C in is 2.991 g/L.
Executive summary:

According to the Guidance on information requirements and chemical safety assessment, chapter R.7a, pp 77 and 107, it is prudent to take the critical micelle concentration (CMC) as a solubility limit. Water solubility is measured by tensiometry, a classical method to determine the CMC of a surfactant.

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2012-2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
estimation of water solubility of water soluble part of test item by DOC
GLP compliance:
no
Type of method:
other: DOC
Key result
Water solubility:
> 170 mg/L
Temp.:
23 °C
Remarks on result:
other: reconstituted water according to ISO 6431-1982
Key result
Water solubility:
> 580 mg/L
Temp.:
23 °C
Remarks on result:
other: Milli-Q water
Conclusions:
The water soluble fraction of the test item is moderately soluble in Milli-Q water (> 580mg/L at 23 °C) and also moderatly soluble in reconstituted water as used for aquatic tox testing (> 170 mg/L at 23 °C).

Description of key information

CMC (water solubility): 2.991 g/L at 20°C

DOC-water solublity: > 170 mg/L at 23°C

Key value for chemical safety assessment

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

Additional information

As the test item is a surfactant, the critical micelle concentration (CMC) is considered as a solubility limit in water of the test item. HPLC-spectra from diluted samples differ from the spectra of the pure sample, indicating that some part of UVCB may be insoluble. The max dissolved DOC content has been determined as > 170 mg/L at 23 °C in reconstituted water