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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 08 December 2011 and 27 January 2012.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study performed according to GLP and OECD Guideline.
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Specific details on test material used for the study:
Sponsor's identification :Lemonile
Description :clear colourless liquid
Purity :99.9%
Batch number :PE00027352
Date received :03 October 2011
Expiry date :26 October 2013
Storage conditions :room temperature in the dark
Surface tension:
62.3 mN/m
Temp.:
19 °C
Conc.:
0.037 g/L
Remarks on result:
other: The test item was considered not to be surface-active.

  Sample solution concentration

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

Solution

MeanArea

Standard 11.6 mg/l

6.4655 x 106

Standard 10.1 mg/l

5.6576 x 106

Matrix blank

none detected

Sample A1

1.0311 x 107

Sample A2

1.0333 x 107

Mean sample solution concentration = 3.69 x 10-2g/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

19.0

72.87

0.998

73.0

19.0

72.87

0.998

72.5

19.0

72.87

1.005

73.0

19.0

72.87

0.998

72.5

19.0

72.87

1.005

72.5

19.0

72.87

1.005

Mean Calibration Factor = 1.002

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)

115

62.0

19.0

120

62.0

19.0

130

62.5

19.0

138

62.5

19.0

145

62.5

19.0

Mean reading:    62.2 mN/m
Surface tension:  = reading x calibration factor
                          = 62.2 x 1.002
                          = 62.3 mN/m
Temperature:    19.0 ± 0.5ºC
pH of sample solution:  6.3

Validation

The linearity of the detector response with respect to concentration was assessed over the nominal concentration range of 1 to 58 mg/l. This was satisfactory with a correlation coefficient of 0.999 being obtained

Discussion

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

Conclusions:
The surface tension of a 90% saturated aqueous solution (3.69 x 10-2 g/l, determined by HPLC) of test item has been determined to be 62.3 mN/m at 19.0 ± 0.5°C. The test item was considered not to be surface-active

Description of key information

The surface tension of a 90% saturated aqueous solution (3.69 x 10-2 g/l, determined by HPLC) of test item has been determined to be 62.3 mN/m at 19.0 ± 0.5°C.  The test item was considered not to be surface-active (OECD 115)

Key value for chemical safety assessment

Surface tension:
62.3
in mN/m at 20°C and concentration in mg/L:
0.037

Additional information

Surface Tension of Aqueous Solutions. 62.3 mN/min a 90% saturated aqueous solution at 19.0 ± 0.5°C (3.69 g/l, determined by HPLC), using a ringthod 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. The test item was considered not to be surface-active.