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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:
06 October 2003 to 18 November 2003
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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: ISO 304 ("Surface active agents - Determination of Surface Tension by Drawing up Liquid Films").
Deviations:
no
GLP compliance:
yes
Type of method:
plate method
Surface tension:
55.3 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Table 2: Results

Solution

1. determination

2. determination

Time (min)

σcorr (mN/m)

σcorr (mN/m)

0

55.4

54.5

5

55.9

54.7

10

56.0

54.8

Average

55.8

54.7

Average of independent measurements

55.3

 

Temperature: 20 ± 0.3 ºC

Conclusions:
Under the conditions of the test, the surface tension of the test material dissolved in pure water at a concentration of 1 g/L (supernatant after centrifugation) at a temperature of 20 °C was determined to be 55.3 mN/m. The test substance meets the EU definition of surface active. The study is considered to be reliable, relevant and adequate for risk assessment purposes.
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 plate method (with the platinum plate to allow proper assessment of the time dependence of the surface tension). Under the conditions of the test, the surface tension of the test material dissolved in pure water at a concentration of 1 g/L (supernatant after centrifugation) at a temperature of 20 °C was determined to be 55.3 mN/m. The test substance meets the EU definition of surface active.

Description of key information

55.3 mN/m, 20 °C, concentration of 1 g/L, OECD TG 115, EU Method A.5, Martin 2003

Key value for chemical safety assessment

Surface tension:
55.3
in mN/m at 20°C and concentration in mg/L:
1 000

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 plate method (with the platinum plate to allow proper assessment of the time dependence of the surface tension). Under the conditions of the test, the surface tension of the test material dissolved in pure water at a concentration of 1 g/L (supernatant after centrifugation) at a temperature of 20 °C was determined to be 55.3 mN/m. The test substance meets the EU definition of a surface active substance.

The study was performed in line with GLP and an accepted standardised guideline with a high standard of reporting. The study was assigned a reliability score of Klimisch 1 and considered suitable for assessment as an accurate reflection of the test substance.

The available data are considered complete and the result determined, 55.3 mN/m at 20 °C and a concentration of 1 g/L, was taken forward for risk assessment.