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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:
6 February 1990
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
EEC/79/831, Annex V
Deviations:
no
GLP compliance:
yes
Type of method:
ring method
Key result
Surface tension:
57.8 mN/m
Temp.:
25 °C
Conc.:
1 000 mg/L

Six measurements at a temperature of 25 °C, every 5 min, were done:

Measurement

1

2

3

4

5

6

time / min

0

5

10

15

20

25

W / mN/m

56.0

56.9

57.7

58.0

57.9

58.2

Conclusions:
After correction with respect to the table given in the directive A.5. (Harkins-Jordan correction), the final value for the surface tension at 25 °C is:

W= 57.8 mN/m
Executive summary:

 Study data conducted to Guideline EEC/79/831, Annex V Part A.5 in compliance with GLP.

After correction with respect to the table given in the directive A.5. (Harkins-Jordan correction), the final value for the surface tension at 25 °C is:

 

W=57.8 mN/m.

 

 

Description of key information

The surface tension of the aqueous solution at 25 °C has a mean value of 57.8 mN/m. The test item has surface-active properties.

Key value for chemical safety assessment

Surface tension:
57.8
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

A study was conducted according to Guideline EEC/79/831, Annex V Part A.5 in compliance with GLP.

An aqueous solution of the test item in de-ionized water with a concentration of 1000 mg/L was prepared, stirred for 24 hours at room temperature and the solution was adapted to the measurement temperature for 30 minutes. After correction with respect to the table given in the directive A.5. (Harkins-Jordan correction), the test item has a mean surface tension of 57.8 mN/m. As the surface tension is lower than 60 mN/m, the test item has surface-active properties