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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:
Testing was conducted between 05 December 2011 and 13 January 2012.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Study conducted 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. The study report was conclusive, done to a valid guideline and the study was conducted under GLP conditions.
Qualifier:
according to guideline
Guideline:
other: ring method based on ISO 304, 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 Testing of Chemicals, 27 July 1995.
Deviations:
yes
Remarks:
The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension.
Principles of method if other than guideline:
The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. 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 is as a result of the reduced ring dimensions.
GLP compliance:
yes
Type of method:
other: Ring method
Key result
Surface tension:
45.9 mN/m
Temp.:
21 °C
Conc.:
0.008 g/L

 


Results


Sample solution concentration


The mean peak areas relating to the standard and sample solutions are shown in the following table:


































Solution



Mean Peak Area



Standard 20.3 mg/l



1.5878 x 106



Standard 19.7 mg/l



1.5623 x 106



Matrix blank



None detected



Sample A



1.4849 x 105



Sample B



1.5119 x 105



Mean sample solution concentration = 7.60 x 10-3g/l




 


Calibration factor (f)


The readings, temperatures and the corresponding calibration factors for glass double-distilled water are shown in the following table:


 



















































Reading (mN/m)



Temperature (ºC)



Literature Value (mN/m)



Calibration Factor



73.0



21.2



72.53



0.994



72.5



21.0



72.57



1.001



72.5



21.0



72.57



1.001



72.0



20.8



72.60



1.008



72.0



21.0



72.57



1.008



72.0



21.0



72.57



1.008



Mean Calibration Factor = 1.003



 


 


Sample solution readings


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


 




































Time (mins)



Reading (mN/m)



Temperature (ºC)



100



46.0



21.0



120



46.0



21.0



144



46.0



21.0



171



45.5



20.8



191



45.5



21.0



Mean reading                :   45.8 mN/m
Surface tension            = reading x calibration factor
                                         = 45.8 x 1.003
                                         = 45.9 mN/m
Temperature                  :   21.0 ± 0.5ºC
pH of sample solution  :   4.24

Conclusions:
The surface tension of a 90% saturated aqueous solution (7.60 x 10-3 g/, determined by HPLC) of test item has been determined to be 45.9 mN/m at 21.0 ± 0.5°C. The test item was considered to be surface-active.
Executive summary:

Introduction & Method


To determine the surface-tension of the test item. The determination was carried out using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements and a procedure based on the ISO 304 ringthod. With the exception of the following deviation, the experintal procedure used was designed to be compatible with that specified in 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 result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. 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 is as a result of the reduced ring dimensions.


This deviation has been considered not to have affected the integrity of the study.


 


Conclusion


The surface tension ofa 90% saturated aqueous solution (7.60 x 10-3 g/L, determined by HPLC)of test item has been determined to be 45.9 mN/m at 21.0 ± 0.5°C. The test item was considered to be surface-active.

Description of key information

45.9 mN/m @ 21°C.

Key value for chemical safety assessment

Surface tension:
45.9
in mN/m at 20°C and concentration in mg/L:
7.6

Additional information

To determine the surface-tension of the test item. The determination was carried out using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements and a procedure based on the ISO 304 method. With the exception of the following deviation, the experintal procedure used was designed to be compatible with that specified in 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 result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. 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 is as a result of the reduced ring dimensions.

This deviation has been considered not to have affected the integrity of the study.

Conclusion

The surface tension of a 90% saturated aqueous solution (7.60 x 10-3 g/l, determined by HPLC) of test item has been determined to be 45.9 mN/m at 21.0 ± 0.5°C. The test item showed a surface tension lower than 60 mN/m and is considered to be surface-active.

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