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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:
30 December 2011 and 05 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:
equivalent or similar to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
The surface tension result was not corrected using the Harkins-Jordan correction table
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
yes
Remarks:
The surface tension result was not corrected using the Harkins-Jordan correction table
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.
This deviation has been considered not to have affected the integrity of the study.
GLP compliance:
yes
Type of method:
ring method
Key result
Surface tension:
69 mN/m
Temp.:
20 °C
Conc.:
0.004 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 0.494 mg/l

1.5988 x 106

Standard 0.507 mg/l

1.5970 x 106

Matrix blank

None detected

Sample A

8.0587 x 105

Sample B

8.0496 x 105

Mean sample solution concentration = 3.55 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

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.0

20.0

72.72

1.010

72.0

20.0

72.72

1.010

72.0

20.0

72.72

1.010

72.0

20.0

72.72

1.010

72.0

20.0

72.72

1.010

Mean Calibration Factor = 1.008

 


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)

1447

68.0

20.0

1455

68.5

20.0

1462

68.5

20.0

1468

68.5

20.0

1475

68.5

20.0

1481

68.5

20.0

Mean reading                :   68.4 mN/m
Surface tension            = reading x calibration factor
                                         = 68.4 x 1.008
                                         = 69.0 mN/m
Temperature                  :   20.0 ± 0.5ºC
pH of sample solution  :   7.28

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 (3.55 x 10-3 g/l, determined by HPLC) of test item has been determined to be 69.0 mN/m at 20.0 ± 0.5°C. The test item was considered not to be surface-active.
Executive summary:
Surface Tension of Aqueous Solutions. 69.0 mN/m in a 90% saturated aqueous solution (3.55 x 10-3 g/l, determined by HPLC) at 20.0 ± 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 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The test item was considered not to be surface-active.

Description of key information

Surface tension 69.0 mN/m at 20 °C (OECD 115)

Key value for chemical safety assessment

Surface tension:
69
in mN/m at 20°C and concentration in mg/L:
3.55

Additional information

The surface tension of a 90% saturated aqueous solution (3.55 x 10-3 g/l, determined by HPLC) of test item has been determined to be 69.0 mN/m at 20.0 ± 0.5°C. The test item was considered not to be surface-active.