Reaction mass of methyl 2-methylbenzene-1-sulfonate and methyl toluene-4-sulphonate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: German standard method "DIN EN 14370"

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.5 (Surface Tension)

GLP compliance:

yes (incl. QA statement)

Type of method:

plate method

Remarks:

plate tensiometer

Key result

Surface tension:

63.3 mN/m

Temp.:

20 °C

Conc.:

90 other: % of saturated solution

For verification of the measured values demineralized water is also measured. With a correspondence of the measured value σ (20 °C) = 72.5 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of the test item is considered as valid

Conclusions:

The surface tension of the test substance is 63.3 mN/m diluted to 90 % of saturated solution in water at 20 °C.

Executive summary:

According to the German standard method DIN EN 14370 the surface tension of the test item in aqueous solution was determined using a plate tensiometer. A commercially available tensiometer based on the plate method has been used to measure the force which is required to withdraw a horizontally suspended plate from the surface of the test solution. The surface tension was determined in a solution/mixture of 1.0028 g test item in 1 L demineralized water (approx. 1 g/L) at 20 °C. Since the test item was not completely soluble at 1 g/L the suspension was stirred for 24 hours and filtered through 0.45 µm Chromafil Xtra PET 45/25 filter. Clear solutions were obtained after filtration. A mixture of 72 mL filtrate and 8 mL deionized water was prepared and used for the measurement. For verification of the measured values the surface tension of demineralized water was also measured. With a correspondence of the measured value σ (20 °C) of 72.4 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of the test item is considered as valid. The surface tension of the test substance is 63.3 mN/m diluted to 90 % of saturated solution (approx. 0.860 g/L) in water at 20 °C.

Description of key information

According to the German standard method DIN EN 14370 the surface tension of the test item in aqueous solution was determined using a plate tensiometer. A commercially available tensiometer based on the plate method has been used to measure the force which is required to withdraw a horizontally suspended plate from the surface of the test solution.

The surface tension of the test substance is 63.3 mN/m diluted to 90 % of saturated solution (approx. 0.860 g/L) in water at 20 °C.

Key value for chemical safety assessment

Surface tension:

63.3

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

860

Additional information

The concentration was calculated based on water solubility of 0.955 g/L as value for a saturated solution.

For verification of the measured values the surface tension of demineralized water was also measured. With a correspondence of the measured value σ (20 °C) of 72.4 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of the test substance is considered as valid.