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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
Study period:
From June 20, 2017 to June 22, 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
not specified
Type of method:
ring method
Key result
Surface tension:
29 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Water calibration: Temp. = 21 °C, p = 0.998 g/cm3

Result of calibration: Arithmetic mean 71.5 mN/m, standard deviation 0.1 mN/m from 6 measurements (theoretical value: 72.4 mN/m -> correction factor 1.0126)

First test solution: c = 984.9 mg/I, Temp. = 22 °C, p = 0.998 g/cm3, age of the solution: 240 min

Result 1: Arithmetic mean 27.3 mN/m, standard deviation 0.1 mN/m from 6 measurements

Second test solution: c = 1082 mg/1, Temp. = 21 °C, p= 0.998 g/cm3, age of the solution: 298 min

Result 2: Arithmetic mean 29.9 mN/m, standard deviation 0.0 mN/m from 6 measurements

 

Arithmetic mean of two test solutions: 28.6 mN/m (± 1.8 mN/m)

Arithmetic mean corrected by calibration factor determined via water calibration: 29.0 mN/m

Conclusions:
Under the study conditions, the surface tension of the test substance was established at 29.0 mN/m.
Executive summary:

A study was conducted to determine the surface tension of the test substance using ring method according to EU Method A.5 similar to OECD Guideline 115. The two samples were prepared by dissolving the test substance into water at 1 g/L. The test solutions were conditioned for 0.5 h in an ultrasonic bath and tempered at 20 °C. The solutions were light cloudy. Then the automatic measurement was initiated. The average of 6 single measurements was determined per solution. In this case the total measuring time was more than 3000 s per solution. Arithmetic mean was corrected by calibration factor determined via water calibration. Under the study conditions, the surface tension of the test substance was established at 29.0 mN/m (Kintrup, 2017).

Description of key information

The surface tension was determined according to EU Method A.5 and similar to OECD Guideline 115 (Kintrup, 2017).

Key value for chemical safety assessment

Surface tension:
29

Additional information