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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:
20 July 2018 to 24 October 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
yes (incl. certificate)
Remarks:
Date of Inspection: 18 July 2017 to 20 July 2017 Date on Certificate: 28 November 2017
Type of method:
ring method
Key result
Surface tension:
62.7 mN/m
Temp.:
20.4 °C
Conc.:
9 097.1 mg/L

The readings, times and temperatures for the sample solutions are shown in the following tables.

Table 2 - Sample 1

Age of solution (min)

Reading (mN/m)

Temperature (°C)

68

62.5

20.4

72

63.0

20.4

76

63.0

20.4

80

63.0

20.4

84

63.0

20.4

88

63.0

20.4

Table 3 - Sample 2

Age of solution (min)

Reading (mN/m)

Temperature (°C)

119

62.5

20.4

122

62.5

20.4

125

62.0

20.4

129

62.5

20.4

132

62.5

20.4

Mean Sample 1 result: 63.0 mN/m

pH of Sample 1: 4.6

Mean Sample 2 result: 62.4 mN/m

pH of Sample 2: 4.5

Mean result: 62.7 mN/m

Overall temperature: 20.4 ± 0.5 °C

On removal from the 20 °C equilibration, the samples were clear, colorless solutions, with undissolved test item at the top of the solutions and stuck to the sides of the flask. After clean-up, the samples were clear, colorless solutions free from undissolved test item.

According to criteria stated in EC Method A.5, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active.

Conclusions:
The surface tension of duplicate, 90 % saturated solutions of test item in water has been determined to be 62.7 mN/m at 20.4 ± 0.5 °C. The test item was considered not to be surface-active.
Executive summary:

The surface tension of duplicate, 90 % saturated solutions of test item in water has been determined to be 62.7 mN/m at 20.4 ± 0.5 °C, using a ring method, designed to be compatible with Method A.5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The test item was considered not to be surface-active.

Description of key information

The surface tension of duplicate, 90 % saturated solutions of test item in water has been determined to be 62.7 mN/m at 20.4 ± 0.5 °C. The test item was considered not to be surface-active.

Key value for chemical safety assessment

Surface tension:
62.7
in mN/m at 20°C and concentration in mg/L:
9 097.1

Additional information

The surface tension of duplicate, 90 % saturated solutions of test item in water has been determined to be 62.7 mN/m at 20.4 ± 0.5 °C, using a ring method, designed to be compatible with Method A.5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The test item was considered not to be surface-active.