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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was carried out in a laboratory accredited under GLP, however the study itself was not subject to GLP audit. The study followed OECD TG 115 (1995) and Method A5 in Regulation (EC) No 440/2008 without deviations.
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
no
Surface tension:
63.3 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: pH 6.7-6.8

Sample solution A surface tension measurements:

Time (mins)

Temperature (°C)

Reading (mN/m)

117

20.0

64.0

145

20.0

63.5

173

20.0

63.5

200

20.0

63.5

226

20.0

63.5

251

20.0

63.5

Mean sample reading = 63.5 *

* Last five values considered to be a stable plateau of surface tension readings and therefore used in the calculation of the mean.

Sample solution B surface tension measurements:

Time (mins)

Temperature (°C)

Reading (mN/m)

129

20.0

63.5

158

20.0

63.5

187

20.0

63.5

212

20.0

63.5

238

20.0

63.5

264

20.0

63.5

Mean sample reading = 63.5

Surface tension = reading x calibration factor

- Sample Solution A = 63.5 x 0.996

- Sample Solution A = 63.2 mN/m

- Sample Solution B = 63.5 x 0.997

- Sample Solution B = 63.3 mN/m

Water calibration data relevant to sample dolution A:

Reading (mN/m)

Temperature (°C)

Literature Value (mN/m)

Calibration Factor

72.5

20.0

72.72

1.003

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

Mean calibration factor = 0.996 *

* Calculated using the last six calibration factor values which bracket the sample solution reading values used in the definitive test result.

Water calibration data relevant to sample dolution B:

Reading (mN/m)

Temperature (°C)

Literature Value (mN/m)

Calibration Factor

72.5

20.0

72.72

1.003

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

73.0

20.0

72.72

0.996

Mean calibration factor = 0.997

Conclusions:
The average surface tension of duplicate 1.0 g/L solutions of test item in water has been determined to be 63.3 mN/m at 20.0 ± 0.5 °C.
Executive summary:

To determine the surface tension of the test item a harmonised ring method study was performed according to OECD TG 115 (1995) and Method A5 in Regulation (EC) No 440/2008. In this study the average surface tension of duplicate 1.0 g/L solutions of test item in water has been determined to be 63.3 mN/m at 20.0 ± 0.5 °C.

Description of key information

63.3 mN/m at 20 °C, OECD 115, GLP, ring method (torsion balance), O'Connor 2015

Key value for chemical safety assessment

Surface tension:
63.3
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The average surface tension of duplicate 1.0 g/L solutions of test item in water has been determined to be 63.3 mN/m at 20.0 ± 0.5 °C.