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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:
The study was conducted between 20 March 2014 and 27 June 2014.
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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
other: Torsion balance
Specific details on test material used for the study:
Batch: SC00010054
Purity: 96.5%
Physical State / Appearance: Clear colorless liquid
Surface tension:
71.5 mN/m
Temp.:
20 °C
Conc.:
90
Remarks on result:
other: % of saturation concentration

Calibration factor (φb)

The readings, temperatures and the corresponding calibration factors for high quality water are shown in the following tables:

Sample A

Reading

(mN/m)

Temperature

(°C)

Literature value

(mN/m)

Calibration factor

72.5

22.0

72.41

0.999

72.5

22.0

72.41

0.999

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

Mean calibration factor

0.998

 

Sample B

Reading

(mN/m)

Temperature

(°C)

Literature value

(mN/m)

Calibration factor

72.5

22.0

72.41

0.999

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

72.5

22.2

72.38

0.998

Mean calibration factor

0.998

 

Sample solution readings

The readings, times and temperatures for the sample solution are shown in the following tables:

Sample A

Time

(mins)

Reading

(mN/m)

Temperature

(°C)

69

68.5

22.0

89

69.5

22.0

109

69.5

22.2

127

69.5

22.2

146

71.5

22.2

165

71.5

22.2

181

71.5

22.2

198

71.5

22.2

214

71.5

22.2

Mean sample reading

71.5*

*average taken from 146 minutes reading onwards

 

Sample B

Time

(mins)

Reading

(mN/m)

Temperature

(°C)

80

71.5

22.0

99

71.5

22.0

118

71.5

22.2

136

71.5

22.2

155

71.5

22.2

173

71.5

22.2

189

71.5

22.2

206

71.5

22.2

223

71.5

22.2

Mean sample reading

71.5*

Sample 1 : 71.5 mN/m

Sample 2 : 71.5 mN/m

Mean : 71.5 mN/m

Temperature : 20 ± 0.5 ºC

pH of sample solution :

Sample 1 = 6.18

Sample 2 = 6.24

A platinum ring with a reduced circumference of 4 cm was used, whereas the guidelines specify 6 cm. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (± 0.5 mN/m). This procedure with respect to the reduced ring dimensions has been considered not to have affected the integrity of the test.

Excess test item was present after the sample had shaken for 24 hours at 20 °C showing saturation had occurred.

Substances showing a surface tension lower than 60 mN/m under the conditions of this method, should be regarded as being surface active.

Conclusions:
The surface tension of duplicate 90% aqueous saturated solutions of test item has been determined to be 71.5 mN/m at 20 ± 0.5 °C. The test item is considered not to be surface-active item.
Executive summary:

The determination was carried out using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements using a procedure designed to be compatible with Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995. The surface tension of duplicate 90% aqueous saturated solutions of test item has been determined to be 71.5 mN/m at 20 ± 0.5 °C. The test item is considered not to be surface active.

Description of key information

The determination was carried out using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements using a procedure designed to be compatible with Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995. The surface tension of duplicate 90% aqueous saturated solutions of test item has been determined to be 71.5 mN/m at 20 ± 0.5 °C. The test item is considered not to be surface-active item.

Key value for chemical safety assessment

Surface tension:
71.5

Additional information

The surface tension of the test substance was assessed according to Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995 using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements. The surface tension of duplicate 90% aqueous saturated solutions of test item has been determined to be 71.5 mN/m at 20 ± 0.5 °C. Substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active. The test item is not considered to be surface-active.