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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:
2009-11-17 to 2010-03-17
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
yes
Remarks:
yes (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, direct reading for surface tension obtained was within required accuracy of ± 0.5 mN/m.
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
yes (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, direct reading for surface tension obtained was within required accuracy of ± 0.5 mN/m.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Key result
Surface tension:
54.8 mN/m
Temp.:
21 °C
Conc.:
0.307 g/L
Remarks on result:
other: The surface tension of a 0.307 g/l solution (TOC) of test material has been determined to be 54.8 mN/m at 21.0 ± 0.5°C. The test material is considered to be a surface-active material.

Results:

Sample solution concentratrion:

Concentrations obtained from the calibration curve are shown in table 1:

Table 1: Sample Solution Concentration

Solution

TOC Concentration (mg/l)

Matrix blank

1.906

Sample

308.8

Mean sample solution concentration = 0.307 g/l

Calibration Factor (f):

The readings, temperatures and the corresponding calibration factors for reverse osmosis water are shown in the table 2:

Table 2: Reverse Osmosis calibration factor

Reading (mN/m)

Temperature (°C)

Literature value (mN/m)

Calibration factor

71.5

21.2

72.53

1.014

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

72.0

21.4

72.50

1.007

72.5

21.4

72.50

1.000

Mean Calibration Factor = 1.001

 

Sample Solution readings:

The readings, times and temperatures for the sample solution are shown in table 3:

Table 3: Sample solution readings

Time (Mins)

Reading (mN/m)

Temperature (°C)

83

53.5

21.2

90

54.5

21.2

96

54.5

21.2

100

55.0

21.2

105

54.5

21.2

110

55.0

21.4

 

Mean Reading                  54.7 mN/m

Surface Tension                reading X calibration factor

                                        54.7 X 1.001

                                        54.8 mN/m

Temperature                     21.0 ± 0.5 °C

pH of sample solution    6.51

Conclusions:
A surface tension of a 0.307 g/l solution (TOC) of Crude Sulphate Turpentine was obtained to be 54.8 mN/m. The result was obtained in a reliable study conducted according to OECD 115, and in compliance with GLP. The test substance is considered to be surface active.

Description of key information

Surface Tension: 54.8 mN/m (OECD 115), surface active

Key value for chemical safety assessment

Surface tension:
54.8
in mN/m at 20°C and concentration in mg/L:
0.307

Additional information

An aqueous solution surface tension value of 54.8 mN/m at 21°C has been determined for TOPP in a GLP study according to OECD 115. TOPP is considered to be weakly surface active.