Tall oil

Surface tension

Link to relevant study record(s)

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

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.