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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
11 July 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
29.1 mN/m
Temp.:
20 °C
Remarks on result:
other: Corrected value

A constant surface tension was reached after about 524 sec. Afterwards, four further measurements were performed each after a minimum equilibrium time of 524 sec in order to confirm the value obtained by the first measurement.

The surface tension of the test material aqueous solution read on the instrument was 28.7 mN/m at 20 °C using the ring method representing the mean of five separate measurements. The measured values were corrected with Harkins-Jordan correction factor. The details are shown in Table 1.

The measured surface tension was multiplied by Φb resulting in a corrected surface tension of 29.1 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.

Table 1: Measured surface tension values and equilibrium times.

Surface tension (mN/m)

Time (sec)

28.66

524

28.67

547

28.70

571

28.71

596

28.70

620

 

Conclusions:
Under the conditions of the study the corrected surface tension of the test material was 29.1 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.
Executive summary:

The surface tension of the test material was determined in accordance with the standardised guidelines OECD 115 and EU Method A.5, using the ring method under GLP conditions.

The liquid to be measured was transferred to the measurement vessel. The measurement vessel was placed on the sample table. The sample was raised until the ring is 1 to 2 mm above the surface of the liquid. Then the measurement was started. In order to describe the time dependence of the surface tension after transferring the solution to the measurement vessel, the measurement was continued with increasing equilibrium time until a constant surface tension was reached.

A constant surface tension was reached after about 524 sec. Afterwards, four further measurements were performed each after a minimum equilibrium time of 524 sec in order to confirm the value obtained by the first measurement. The surface tension of the test material aqueous solution read on the instrument was 28.7 mN/m at 20 °C using the ring method representing the mean of five separate measurements. The measured surface tension was multiplied by Φb to give a corrected surface tension.

Under the conditions of the study the corrected surface tension of the test material was 29.1 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.

Description of key information

Under the conditions of the study the corrected surface tension of the test material was 29.1 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.

Key value for chemical safety assessment

Surface tension:
29.1

Additional information

The surface tension of the test material was determined in accordance with the standardised guidelines OECD 115 and EU Method A.5, using the ring method under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The liquid to be measured was transferred to the measurement vessel. The measurement vessel was placed on the sample table. The sample was raised until the ring is 1 to 2 mm above the surface of the liquid. Then the measurement was started. In order to describe the time dependence of the surface tension after transferring the solution to the measurement vessel, the measurement was continued with increasing equilibrium time until a constant surface tension was reached.

A constant surface tension was reached after about 524 sec. Afterwards, four further measurements were performed each after a minimum equilibrium time of 524 sec in order to confirm the value obtained by the first measurement. The surface tension of the test material aqueous solution read on the instrument was 28.7 mN/m at 20 °C using the ring method representing the mean of five separate measurements. The measured surface tension was multiplied by Φb to give a corrected surface tension.

Under the conditions of the study the corrected surface tension of the test material was 29.1 mN/m. As the surface tension value was lower than 60 mN/m, the test material is classified as surface active.