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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:
17 December 2012 to 04 April 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
GLP compliance:
yes
Type of method:
plate method
Surface tension:
40.1 mN/m
Temp.:
20 °C
Conc.:
1 000 mg/L

Determination

Time

Surface tension at 20°C of the test item diluted in water
concentration = 1g/L

 

[min]

[mN/m]

1

10

47.8

2

18

45.8

3

41

42.6

4

66

41.4

5

103

41.0

6

123

40.9

7

189

39.9

8

226

40.1

Mean value

--

40.1

Conclusions:
The surface tension of the test item, diluted to 1 g/L in water at 20°C, measured by the plate method using a tensiometer was: σ = 40.1 mN/m
Executive summary:

The surface tension of the test item was determined using a plate tensiometer. A commercially available tensiometer based on the plate method was used to measure the force which is required to withdraw a horizontally suspended plate from the surface of the test solution. The surface tension was determined in a concentration of 1 g/L test item diluted in demineralized water at 20°C.

For verification of the measured values demineralized water was also measured. With a correspondence of the measured value σ (20°C) = 72.5 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature as the surface tension of water, the determination of the surface tension of the test item was considered as valid.

The surface tension of the test item, diluted to 1 g/L in water at 20 °C, measured by the plate method using a tensiometer was: σ = 40.1 mN/m. Hence, the test item has surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20°C is 40.1 mN/m.

Key value for chemical safety assessment

Surface tension:
40.1
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension is determined using a plate tensiometer. A commercially available tensiometer based on the plate method is used to measure the force which is required to withdraw a horizontally suspended plate from the surface of the test material or its solution in water.

Eight measurements at a temperature of 20°C were done.The surface tension of the test item, diluted to 1 g/L in water at 20°C, measured by the plate method using a tensiometer was: σ = 40.1 mN/m.

Hence, the test item has surface-active properties.