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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:
13-05-2014 to 14-05-2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study performed under GLP. All relevant validity criteria were met.
Qualifier:
according 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:
yes (incl. certificate)
Remarks:
inspected: June 2013; signature: June 2013
Type of method:
OECD harmonised ring method
Surface tension:
50.48 mN/m
Temp.:
20 °C
Conc.:
90 other: % saturation
Remarks on result:
other: surface tension of a 90 % saturated aqueous solution of the test item at 20 °C is 50.48 mN/m (standard deviation of 0.03 mN/m) with Harkins-Jordan correction

Determination of the Density

The density of the 90 % saturated aqueous solution of the test item in double distilled water was determined in a preliminary measurement to be 0.999 g/cm3 (20.0 °C).

 

Temperature

The temperature range of the test solution during the whole measurements was 19.9 - 20.0 °C (for the last 10 measurements see Table 1).

 

 Table 1. Surface Tension of the test item

Measurement (1)

Time / min (2)

Surface Tension / mN/m (3)

Temperature / °C

1

23.1

50.40

19.9

2

23.8

50.47

19.9

3

24.5

50.50

19.9

4

25.2

50.50

19.9

5

25.9

50.51

19.9

6

26.6

50.47

19.9

7

27.3

50.47

19.9

8

28.0

50.50

20.0

9

28.7

50.51

20.0

10

29.4

50.47

20.0

 

 

 

 

Mean

-

50.48

19.93

S.D.

 

0.03

0.05

 

 

 

 

SD = standard deviation

(1) of the last 10 measurements

(2) time from transfer of test solution into test vessel until end of each measurement

(3) Measurements were automatically subjected to Harkins & Jordan correction

See reference: Harkins, W.D. and Jordan, H.F. (1930). J. Amer. Chem. Soc., 52, 1751

Conclusions:
The surface tension of a 90% saturated aqueous solution of test item has been determined to be 50.48 mN/m at 20.0 ± 0.5 °C. The test item is considered to be surface-active.
Executive summary:

The surface tension was determined using the ring method of OECD TG 115 and EU Method A.5 under GLP. The surface tension of a 90% saturated aqueous solution of the test item has been determined to be 50.48 mN/m at 20.0 ± 0.5 °C. Substances showing a surface tension lower than 60 mN/m under the conditions of this method, should be regarded as being surface active.

Description of key information

Surface Tension: 50.48 mN/m at 20.0 ± 0.5 °C, OECD TG 115, 2014

Key value for chemical safety assessment

Surface tension:
50.48

Additional information

Key study : OECD TG 115, 2014 : The surface tension was determined using the ring method of OECD TG 115 and EU Method A.5 under GLP. The surface tension of a 90% saturated aqueous solution of the test item has been determined to be 50.48 mN/m at 20.0 ± 0.5 °C. Substances showing a surface tension lower than 60 mN/m under the conditions of this method, should be regarded as being surface active.