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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:
2009-11-09 to 2010-02-26
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was conducted according to OECD 115 test guideline, and in compliance with GLP.
Qualifier:
according to guideline
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 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
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. Once calibrated, direct reading for surface tension obtained was within required accuracy of ± 0.5 mN/m.
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
63.5 mN/m
Temp.:
22 °C
Conc.:
0.031 g/L
Remarks on result:
other: TOC concentration of the sample

Sample Concentration

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

Table 1: Sample Solution Concentration

Solution

TOC Concentration (mg/l)

Matrix blank

2.49

Sample

33.32

Mean sample solution concentration = 3.08 x 10-2 g/l

Calibration factor

The readings, temperatures and the corresponding calibration factors for glass double-distilled water are shown in table 2:

Table 2: Reverse Osmosis calibration factor

Reading (mN/m)

Temperature (°C)

Literature value (mN/m)

Calibration factor

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

21.8

72.44

0.999

72.5

21.8

72.44

0.999

72.5

21.8

72.44

0.999

Mean Calibration Factor = 0.999

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)

123

63.5

21.8

130

63.5

21.8

136

63.5

21.8

143

63.5

21.8

151

64.0

21.8

 

Mean Reading                  63.6 mN/m

Surface Tension               reading X calibration factor

                                         63.6 X 0.999

                                         63.5 mN/m

Temperature                    22.0 ± 0.5 °C

pH of sample solution   4.15

Conclusions:
A surface tension of a 3.08 x 10-2 g/L solution (TOC) of Distilled Tall Oil was obtained to be 63.5 mN/m. The result was obtained in a reliable study conducted according to OECD 115, and in compliance with GLP. DTO is not considered to be surface active.

Description of key information

Surface Tension: 63.5 mN/m (OECD 115), Not surface active

Key value for chemical safety assessment

Additional information

A reliable aqueous solution surface tension value of 63.5 mN/m at 22°C has been determined for the test substance in accordance with OECD 115. The substance is considered not surface active.