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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:
from 2009-04-27 to 2009-05-28
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study is regarded as reliable without restrctions because it was conducted in accordance with GLP regulation and guideline.
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
440/2008/EC; 31 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
July 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
72.7 mN/m
Temp.:
20 °C
Conc.:
32.8 other: mg/500 mL

Result

In order to describe the time dependence of the surface tension, after transferring the solution to the measurement vessel, repeated measurements were carried out, with increasing the equilibrium time. A constant surface tension was reached after about 110 sec (see Table 1).

The surface tension of the test item aqueous solution (32.8 mg / 500 ml) was found to be 72.7 mN/m at 20 °C using the ring method, representing the mean of five separate measurements. The equilibrium time for these five measurements was in a range of 110 - 112 sec. The details are shown in Table 2.

The measured surface tension was multiplied by phia and than corrected according to Harkins and Jordan by 0 mN/m, resulting in a corrected surface tension of 72.7 mN/m.

As this value is higher than 60 mN/m, the test item is not classified as surface active.

 

Table 1: Time dependence of the surface tension after transferring the solution to the measurement vessel

Surface tension (mN/m)

Equilibrium time (sec)

15

16

36

33

44

47

59

60

72.4

100

72.5

110

Equilibrium time = time after transferring the solution to the vessel until measuring the surface tension of the solution

 

Table 2: Measured surface tension values and equilibrium times

Surface tension (mN/m)

Equilibrium time (sec)

72.5

110

72.9

111

72.7

110

72.5

112

72.7

110

Equilibrium time = time after transferring the solution to the vessel until measuring the surface tension of the solution

Conclusions:
The surface tension of the test item aqueous solution was found to be 72.7 mN/m at 20 °C, using the ring method. As this value is higher than 60 mN/m, teh test item is not classified as surface active.
Executive summary:

The surface tension of the test item (aqueous solution) was determined according to OECD 115 and EU Method A.5, resulting in 72.7 mN/m at 20 °C, using the ring method. As this value is higher than 60 mN/m, the test item is not classified as surface active.

Description of key information

The surface tension of the test item (aqueous solution) was determined according to EU Method A.5, resulting in 72.7 mN/m at 20 °C.

Key value for chemical safety assessment

Surface tension:
72.7
in mN/m at 20°C and concentration in mg/L:
16.4

Additional information

The surface tension of the test item (aqueous solution) was determined according to OECD 115 and EU Method A.5, resulting in 72.7 mN/m at 20 °C, using the ring method. As this value is higher than 60 mN/m, the test item is not classified as surface active.