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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
yes
Remarks:
Measurement performed on saturated solution.
GLP compliance:
no
Type of method:
ring method
Surface tension:
2.5 mN/m
Temp.:
23 °C
Conc.:
6 mg/L

Sample

Surface Tension

water (ultrapure)

72.0 mN/m

MSSA in water (6 μg/ml)

2 mN/m (1st reading)

3 mN/m (2nd reading)

2.5 ± 0.5 mN/m (mean)

 

No change of surface tension was observable when the measurement was repeated after 10 min.

Description of key information

Surface tension = 2.5 mN/m at 23 °C, concentration in water ca. 6 mg/L (OECD Guideline 115, ring method)

Key value for chemical safety assessment

Additional information

The surface tension was measured using a saturated solution of the test item.

Considering that distilled water has a surface tension of 72.75 mN/m at 20 °C, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface-active materials. Considering the surface tension of 2.5 mN/m at 23 °C, determined for the test substance, it can be concluded that the test substance is not surface active.