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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:
2010-09-30 - 2010-11-05
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
The surface tension of the test item has been determined using a 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.
Deviations:
yes
Remarks:
the surface tension result was not corrected using the Harkins-Jordan correction table (not applicable to the apparatus). A direct reading for the surface tension within the required accuracy is obtained. The deviation has not affected the study integrity
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Specific details on test material used for the study:
Sponsor's identification: Amine C8
Description: dark brown liquid
Batch number: T7-271109
Date received: 21 September 2010
Expiry date: 31 December 2011
Storage conditions: room temperature in the dark
Key result
Surface tension:
66.8 mN/m
Temp.:
21.2 °C
Conc.:
1.04 g/L

Results

Calibration factor (phi)

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

21.0

72.6

0.994

73.0

21.2

72.5

0.994

72.5

21.2

72.5

1.00

72.5

21.2

72.5

1.00

72.5

21.4

72.5

1.00

72.5

21.4

72.5

1.00

Mean Calibration Factor = 0.998

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)

74

66.5

21.2

86

67.0

21.2

96

67.0

21.2

106

67.0

21.4

119

67.0

21.4

Mean reading              :  66.9 mN/m
Surface tension           = reading x calibration factor
                                  = 66.9 x 0.998
                                  = 66.8 mN/m
Temperature                :  21.2 ± 0.5ºC
pH of sample solution   :  10.2

Conclusions:
The surface tension of a 1.04 g/l solution of test item has been determined to be 66.8 mN/m at 21.2 ± 0.5°C. The test item is considered not to be surface-active.
Executive summary:

The surface tension of the test item has been determined to be 66.8 mN/m (1.04 g/l solution) at 21.2 ± 0.5°C, using a 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. The test item is considered not to be surface-active.

Description of key information

The surface tension of the test substance was determined to be 66.8 mN/m (1.04 g/L solution) at 21.2 ± 0.5°C, using a ring method based on ISO 304, designed to be compatible with EC test method A.5, under GLP conditions (Butler and White, 2010). The test item is considered not to be surface-active.

Key value for chemical safety assessment

Surface tension:
66.8
in mN/m at 20°C and concentration in mg/L:
1 040

Additional information

Although the temperature of measurement was slightly above 20.0 °C, this is not considered to influence the test result significantly.