Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Testing was conducted on 12 February 2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2008
Report Date:
2008

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
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.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Sponsor's identification: C-Y9
Description: orange powder
Lot number: 071217
Purity: 95.8%
Date received: 24 January 2008
Storage conditions: room temperature, in the dark until 11 February 2008, thereafter at room temperature, in the dark over silica gel.

Results and discussion

Surface tension
Surface tension:
72.3 mN/m
Temp.:
21.5 °C
Conc.:
1.03 g/L

Any other information on results incl. tables

Results:

Calibration factor

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

Reading (mN/m)

Temperature (°C)

Literature Value (mN/m)

Calibration Factor

72.5

21.4

72.50

1.000

73.0

21.2

72.53

0.994

73.0

21.4

72.50

0.993

73.0

21.4

72.50

0.993

72.5

21.6

72.47

1.000

72.5

21.8

72.44

0.999

72.5

21.8

72.44

0.999

72.5

21.6

72.47

1.000

Mean calibration factor = 0.997 (last six readings)

Sample solution readings

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

Time (mins)

Reading (mN/m)

Temperature (°C)

108

72.5

21.4

119

72.5

21.6

159

72.5

21.8

168

72.5

21.8

181

72.5

21.6

Mean reading: 72.5 mN/m

Surface tension = reading x calibration factor

= 72.5 x 0.997

= 72.3 mN/m

Temperature: 21.5 ± 0.5 °C

pH of sample solution: 6.75

Discussion

Substances showing a surface tension lower than 60 mN/m should be regarded as being surface-active.

Applicant's summary and conclusion

Conclusions:
The surface tension of a 1.03 g/l solution (0.983 g/l corrected for purity) of test material has been determined to be 72.3 mN/m at 21.5 ± 0.5°C. The test material is considered not to be a surface-active material.
Executive summary:

The test material was determined to have a surface tension of 72.3 mN/m (1.03 g/l solution, 0.983 g/l correct for purity) at 21.5 ± 0.5°C, using a ring method based on ISO 304, Method A5 of Commission Directive 92/69/EEC.

The test material is considered not to be a surface-active material.