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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:
16 March 1990 - 20 March 1990
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes
Type of method:
ring method
Surface tension:
71.4 mN/m
Temp.:
21.2 °C
Remarks on result:
other: The temperature was within ± 0.3 of 21.2 °C

Table 1 Summary of Calibration Readings

Reading (mN/m)

Temperature of Determination (°C)

Literature Value (mN/m)

Calibration Factor

72.9

73.0

73.0

73.0

72.7

20.7

20.7

21.0

21.1

21.2

72.64

72.64

72.60

72.58

72.57

0.996

0.995

0.995

0.994

0.998

Calibration factor = literature value / reading

Mean calibration factor = 0.996

 

Table 2 Summary of Sample Solution Readings

Time (minutes)

Surface tension reading (mN/m)

Temperature (°C)

31

41

53

78

85

64.8

72.1

72.1

71.2

71.4

20.8

21.0

21.1

21.1

21.5

*Mean of last four readings = 71.7

Calibration factor = 0.996

Corrected surface tension value = 71.7 x 0.996 mN/m = 71.4 mN/m

 

* The last four readings were used since this is where it is apparent that equilibrium was achieved.

Conclusions:
The surface tension of a 90 % saturated solution of the test material has been determined to be 71.4 mN/m at 21.2 ± 0.3 °C.
Executive summary:

The surface tension of a 90 % saturated solution of the test material was determined in accordance with the standardised guideline EU Method A.5.

The concentration of test material in the solution was determined to be 2.9 mg/L. The surface tension was determined on a Surface Tensiometer (ISO ring method) and was found to be 71.4 mN/m at 21.2 ± 0.3 °C.

Description of key information

 The surface tension was found to be 71.4 mN/m at 21.2 ± 0.3 °C.

Key value for chemical safety assessment

Surface tension:
71.4
in mN/m at 20°C and concentration in mg/L:
2.9

Additional information

The surface tension of a 90 % saturated solution of the test material was determined in accordance with GLP and the standardised guideline EU Method A.5.

The concentration of test material in the solution was determined to be 2.9 mg/L. The surface tension was determined on a Surface Tensiometer (ISO ring method) and was found to be 71.4 mN/m at 21.2 ± 0.3 °C.