Thiophene, tetrahydro-, 1,1-dioxide, 3-(C9-11-isoalkyloxy) derivs., C10-rich

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Testing was conducted between 27 October 2011 and 9 November 2011.

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:

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

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

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Surface tension:

46.5 mN/m

Temp.:

21.2 °C

Conc.:

0.05 g/L

Remarks on result:

other: Temp = 21.2 ± 0.5°C.

Results

Sample solution concentration

The mean total peak areas relating to the standard and sample solutions are shown in the following table:

Solution	Mean total Peak Areas
Standard 25.2 mg/l	8.569 x 10^5
Standard 25.2mg/l	7.694 x 10^5
Sample A	4.595 x 10^5
Sample B	4.428 x 10^5
Mean sample solution concentration = 5.00 x 10^-2g/l

The matrix blank contained some peaks within the retention range of the test item but were not subtracted as they were probably in the standards and sample.

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	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
72.5	21.2	72.53	1.000
72.5	21.2	72.53	1.000
Mean Calibration Factor = 1.000

 

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)
71	46.5	21.2
79	46.5	21.2
85	46.5	21.2
92	46.5	21.2
98	46.5	21.2

Mean reading               :   46.5 mN/m
Surface tension           = reading x calibration factor
                                    = 46.5 x 1.000
                                    = 46.5 mN/m
Temperature               :   21.2 ± 0.5°C
pH of sample solution  :   5.9

Validation

The linearity of the detector response with respect to concentration was assessed over the nominal concentration range of 5 to 50 mg/l. This was satisfactory with a correlation coefficient (r²) of 0.991 being obtained.

Conclusions:

The surface tension of a 5.00 x 10-2 g/l solution of test item has been determined to be 46.5 mN/m at 21.2 ± 0.5°C. The test item was considered to be surface-active.

Executive summary:

The surface tension was 46.5 mN/m at 21.2 ± 0.5°C for a 5.00 x 10^-2 g/l solution of test item, 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 to be surface-active.

Description of key information

The surface tension of the substance was determined to be 46.5 mN/m; study conducted in accordance with OECD 115 and EU Method A.5; Fox and White (2011)

Key value for chemical safety assessment

Surface tension:

46.5

in mN/m at 20°C and concentration in mg/L:

0.5

Additional information

In a GLP compliant surface tension study conducted in accordance with standardised guidelines, the surface tension of the test substance was determined. Under the conditions of the test, the surface tension of the substance was determined to be 46.5 mN/m at 21.2 ± 0.5°C and concentration of 50 mg/L.