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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:
25 July 2008 to 17 November 2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
- see below
Principles of method if other than guideline:
The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (± 0.5 mN/m); this is as a result of the reduced ring dimensions. This deviation has been considered not to have affected the integrity of the study.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Surface tension:
72.2 mN/m
Temp.:
21.8 °C
Conc.:
1.03 g/L

Table 2: Calibration Factor

Reading (mN/m)

Temperature (°C)

Literature Value (mN/m)

Calibration Factor

72.0

21.8

72.44

1.006

73.0

21.8

72.44

0.992

73.0

21.8

72.44

0.992

72.5

21.8

72.44

0.999

72.5

21.8

72.44

0.999

72.5

21.8

72.44

0.999

Mean Calibration Factor = 0.998

Table 3: Sample Solution Readings

Time (mins)

Reading (mN/m)

Temperature (°C)

78

73.0

21.8

85

72.0

21.8

100

72.0

21.8

105

72.5

21.8

120

72.0

21.8

- Mean reading: 72.3 mN/m

- Surface tension:

= reading x calibration factor

= 72.3 mN/m x 0.998

= 72.2 mN/m

- Temperature: 21.8 ± 0.5

- pH of sample solution: 2.8

Conclusions:
Under the conditions of the study, the surface tension of the test material has been determined to be 72.2 mN/m at 21.8 ± 0.5 °C. The test material is considered not to be a surface-active material.
Executive summary:

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

The surface tension of the test material was determined to be 72.2 mN/m, at 21.8 ± 0.5 °C as 1.03 g/L solution of test material. As the result is greater than 60 mN/m, the test material is not considered to be surface active.

Description of key information

Surface tension = 72.2 mN/m at 21.8 ± 0.5 °C, 1.03 g/L solution of test material, EU Method A.5., Butler & O'Connor (2008)

Key value for chemical safety assessment

Surface tension:
72.2
in mN/m at 20°C and concentration in mg/L:
1 030

Additional information

The surface tension of the test material was determined under GLP conditions and in accordance with the standardised guideline EU Method A.5., following the ring method. The study was assigned a reliability score of 1 in line with the principles for assessing data quality as defined by Klimisch (1997).

The surface tension of the test material was determined to be 72.2 mN/m, at 21.8 ± 0.5 °C as 1.03 g/L solution of test material. As the result is greater than 60 mN/m, the test material is not considered to be surface active.