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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:
February from 19 to 20, 1991
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
yes
Remarks:
As an alternative, Wilhelmy plate method was used instead of ring method
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
GLP compliance:
yes
Type of method:
plate method
Surface tension:
72.4 mN/m
Temp.:
20 °C
Conc.:
0.1 g/L
Remarks on result:
other: average value of two experiments.
Surface tension:
69.3 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: average value of two experiments.
Surface tension:
59 mN/m
Temp.:
20 °C
Conc.:
10 g/L
Remarks on result:
other: average value of two experiments.

The results obtained in the two experiments are presented below.

Experiment 1

Concentration
(g/l)
σ (solution) mN/m σ
corr. For φb
 (mN/m)
minutes readings

10 g/l

0

60.4

60.1

1

59.9

59.6

5

59.5

59.2

10

59.1

58.8

15

58.9

58.6

20

58.8

58.5

1.0 g/l

 

0

70.4

70.0

1

70.0

69.6

5

69.9

69.5

10

69.8

69.4

0.1 g/l

0

72.5

72.1

1 72.4 72.0
5 72.6 72.2
10 72.7 72.3

Experiment 2

Concentration
(g/l)
σ (solution) mN/m σ
corr. For φb
 (mN/m)
minutes readings

10 g/l

0

61.0

60.7

1

60.6

60.3

5

60.1

59.8

10

59.9

59.6

15

59.8

59.5

20

59.7

59.4

1.0 g/l

0

70.2

69.8

1

69.9

69.5

5

69.6

69.2

10

69.6

69.2

0.1 g/l

 

 

0

72.7

72.3

1

72.4

72.3

5

72.8

72.4

10

72.9

72.5

The Harkins-Jordan hydrostatic correction is not necessary when using the Wilhelmy plate method.

Conclusions:
The substance is not surface active.
Executive summary:

The substance was assessed for its surface tension by using the Wilhemy plate method, according to the guidelines OECD 115, EEC A.5 and ISO 304. Three different concentrations (two preparations of each concentration) of the substance were prepared in distilled water and their surface tension was measured in specific time intervals, at the temperature of 20 °C. The reading was calibrated by the use of double distilled water and the calibration factor was determined in order to be used for the calculation of the surface tension of the test substance.

Surface tension, at 20 °C, obtained as mean value of the two experiments:

σ = 72.4 mN/m at 0.1 g/l

σ = 69.3 mN/m at 1.0 g/l

σ = 59.0 mN/m at 10 g/l

Conclusion

The substance is not considered to be a surface-active as the surface tension of the two out of three concentrations is above 60 mN/m, while the surface tension of the higher concentration is sligthly below 60 mN/m.

Description of key information

Non-surface active

Key value for chemical safety assessment

Surface tension:
69.3
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

OECD guideline 115 - plate method