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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: Guidance on information and chemical safety asessment, chapter R.7a: Endpoint specific guidance
Version / remarks:
July 2017
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: ISO-standard No 304-1985
Deviations:
no
GLP compliance:
not specified
Type of method:
other: Determination of the Critical Micelle Concentration according to Guidance R. 7a and ISO 304-1985
Key result
Water solubility:
0.002 g/L
Conc. based on:
test mat.
Temp.:
20 °C
pH:
5.67
Remarks on result:
other: Critical Micelle Concentration

Table 1: Water solubility of the test item

Curve

Straight line 1

Straight line 2

CMC (g/L)

Average

Standard deviation

1

y = -15.47 ln(x)

-55.291

y = -3.781 ln(x) +15.519

0.0024

0.0023

0.0001

2

y = -21.65 ln(x)

-99.045

y = -1.685 ln(x) +22.151

0.0023

3

y = -19.71 ln(x)

-88.213

y = -1.213ln(x) +23.929

0.0023

The individual results differ by 2.5%. Global result is:

CMC (water solubility) at 20 °C in water: 0.0023 ± 0.0001 g/L

The pH of a solution with a concentration of 1.081 mg/L. The test item is measured at 20 °C (pH = 5.67)

Conclusions:
The Critical Micelle Concentration of the test item was determined to be 0.0023 ± 0.0001 g/L at 20 °C (pH = 5.67).
Executive summary:

The Critical Micelle Concentration (CMC) of the test item was determined as a solubility limit according to Guidance on information requirements and chemical safety assessment, chapter R.7a, pp 77 and 107 and ISO-standard 304-1985 since the test item was established to be a surfactant. The Critical Micelle Concentration of the test item was determined to be 0.0023 ± 0.0001 g/L at 20 °C (pH = 5.67).

Description of key information

The Critical Micelle Concentration of the test item was determined to be 0.0023 ± 0.0001 g/L at 20 °C (pH = 5.67).

Key value for chemical safety assessment

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

Additional information

The Critical Micelle Concentration (CMC) of the test item was determined as a solubility limit according to Guidance on information requirements and chemical safety assessment, chapter R.7a, pp 77 and 107 and ISO-standard 304-1985 since the test item was established to be a surfactant. The Critical Micelle Concentration of the test item was determined to be 0.0023 ± 0.0001 g/L at 20 °C (pH = 5.67).