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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:
2010-04-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
no
GLP compliance:
no
Type of method:
OECD harmonised ring method
Key result
Surface tension:
71.8 mN/m
Temp.:
20 °C
Conc.:
3 mg/L

The solution to be measured is transferred to the measurement vessel, taking care to avoid foaming. The measurement vessel was placed on the table of the test apparatus. The measurement vessel was raised until the ring was immersed below the surface of the solution. The time from starting the measurement was recorded (see table). Subsequently, the table top was lowered gradually and evenly at a rate of 0.3 cm/min to detach the ring from the surface until the maximum force was reached. The force was read on the tensiometer. The measurements were repeated until a constant surface tension value in 6 measurements is reached.

Measurement

1

2

3

4

5

6

Time (s)

30

92

152

212

272

333

σ (mN/m)

71.82

71.77

71.77

71.79

71.78

71.78

 

The surface tension of the aqueous solution at 20 °C is 71.8 mN/m. Due to the fact that the surface tension is higher than 60 mN/m, the test item has no surface-active properties.

Conclusions:
The surface tension of the aqueous solution at 20 °C is 71.8 mN/m.
Executive summary:

A study was conducted according to EU Regulation No. 440/2008 andOECD Guideline No. 115 for the testing of chemicalsto determine the surface tension of an aqueous solution of the test item using the ring method. The surface tension of the aqueous solution at 20 °C is 71.8 mN/m. Due to the fact that the surface tension is higher than 60 mN/m, the test item has no surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C is 71.8 mN/m (reference 4.10-1).

Key value for chemical safety assessment

Surface tension:
71.8
in mN/m at 20°C and concentration in mg/L:
3

Additional information

A study was conducted according to EU Regulation No. 440/2008 and OECD Guideline No. 115 for the testing of chemicals to determine the surface tension of an aqueous solution of the test item using the ring method. The surface tension of the aqueous solution at 20 °C is 71.8 mN/m. Due to the fact that the surface tension is higher than 60 mN/m, the test item has no surface-active properties.