Benzyl salicylate

Surface tension

Link to relevant study record(s)

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

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

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 10^6
Standard 0.507 mg/l	1.5970 x 10^6
Matrix blank	None detected
Sample A	8.0587 x 10^5
Sample B	8.0496 x 10^5
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.