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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Study period:
May 4, 2010 to May 6, 2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Read across study
Justification for type of information:
Refer to section 13 of IUCLID for details on the read-across justification.
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Key result
Surface tension:
38.5 mN/m
Temp.:
20 °C
Conc.:
12.2 mg/L

The CMC of the test material was found to be 13.6 mg/L and at 90% of this concentration, i.e., 12.2 mg/L, the surface tension was determined to be 38.5 mN/m.

An analysis of variance test revealed that there is no statistically significant difference (at P = 0.484) of the mean values between pure water and water containing 0.1 – 0.5 mL/L of methanol. It can therefore be assumed that a methanol content within this range has no impact on the surface tension of the test solutions.

Conclusions:
At 90% of the above the estimated solubility limit (i.e. 12.5 mg/L), using the determined surface tension concentration dependence, the surface tension was calculated to be 38.5 mN/m.
Executive summary:

The surface tension of the test material was determined according to OECD Guideline 115. The critical micelle concentration (CMC) was equivalent to 13.6 mg/L. This value was used as an approximation of the water solubility limit. At 90% of the above the estimated solubility limit (i.e. 12.5 mg/L), using the determined surface tension concentration dependence, the surface tension was calculated to be 38.5 mN/m (Lewandowska, 2010).

Description of key information

The surface tension was determined according to OECD Guideline 115 (Lewandowska, 2010).

Key value for chemical safety assessment

Surface tension:
38.5
in mN/m at 20°C and concentration in mg/L:
12.5

Additional information

Value for the read across substance, amides, C8-18 (even numbered) and C18-unsatd., N-(hydroxyethyl).