Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
5 December 2008 - 17 February 2009
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.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report Date:
2010

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
See below
Qualifier:
according to
Guideline:
other: ISO 304
Deviations:
no
Principles of method if other than guideline:
The result was not corrected using the Harkins-Jordan correction table as it was 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.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: liquid (not specified)
Details on test material:
Description: dark brown liquid
Storage conditions: room temperature, in the dark

Results and discussion

Surface tension
Surface tension:
72 mN/m
Temp.:
21 °C
Conc.:
1.13 g/L

Any other information on results incl. tables

The mean calibration factor was determined to be 1.000 based on the surface tension reading for glass double-distilled water.

 

Table 1: Sample Solution Readings

Time (mins)

Reading (mN/m)

Temperature (°C)

73

70.5

21.2

81

72.0

21.2

87

72.0

21.2

93

72.0

21.2

99

72.0

21.2

106

72.0

21.2

 

Mean reading: 72.0 mN/m (last five values used in calculations)

Surface tension = reading x calibration factor = 72.0 x 1.000 = 72 mN/m

Temperature: 21.0 ± 0.5 °C

pH of sample solution: 2.80

Applicant's summary and conclusion

Conclusions:
The surface tension of a 1.13 g/L solution of the test material has been determined to be 72.0 mN/m at 21.0 ± 0.5 °C. The test material is considered not to be surface-active.
Executive summary:

The surface tension of a 1.13 g/L solution of the test material was determined in accordance with the standardised guidelines EU Method A.5 and ISO 304 ring method using a White Electrical Institute interfacial tension balance.

The surface tension was determined to be 72.0 mN/m at 21.0 ± 0.5 °C. Substances showing a surface tension lower than 60 mN/m should be regarded as being surface-active; therefore the test material is considered not to be surface-active.