Dipotassium methanedisulphonate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

24 November 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

OECD harmonised ring method

Key result

Surface tension:

72.4 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Table 1. The calibration using deionised water at 20.0±0.5 °C

nº of measurement	1	2	3	4
water surface tension value, mN/m	71.5	71.4	70.4	71.5

The determined average value of deionised water surface tension is: 71.45 ± 0.06 mN/m. The calibration factor Φb calculated from equation:          

Φb=72.75/71.45=1.02 

Table 2. Measurement of surface tension of aqueous solution of Dipotassium methanedisulphonate (ROPOL G 14) (concentration of the test item equals 1 g/L ) at 20.0±0.5 °C

Measurement N^o	1	2	3	4	5
time of test item transfer to measurement vessel, min	15	30	40	50	60
test item surface tension, mN/m	70.9	70.8	70.9	71.0	70.9

The average value : 70.90 ± 0.07 mN/m.

No distinct dependence of measured values on the surface tension during the transfer time was observed.

The measured surface tension value should be corrected by multiplying by the calibration factor

Φb= = 1.02 (calculated before).

Preliminary corrected value

Φb* 70.90 = 1.02*70.90 = 72.32 mN/m

On the base of the polynomial equation the finally corrected value of test item surface tension is:

σ = -1.183 + 0.946 * 72.32+ 9.927 *10-4 * (72.32)2 =72.4 mN/m

Conclusions:

The value of surface tension of the tested material is 72.4 mN/m at 20ºC and concentration of 1 g/L.

Executive summary:

In accordance with OECD guideline 115 and GLP study, the surface tension of tested substance was determineted by OECD harmonised ring method at the constant measurement temperature of 20.0ºC. The aqueous solution of test item (concentration of the test item equals 1 g/L) was prepared. Five measurements were performed in vessel placed onto the table of the tensiometer. Calibration was performed using deionised water and obtained calibration factor was used to calculate finally corrected value of surface tension of tested item. The surface tension value of test item is 72.4 mN/m.

Description of key information

Key study: Test method according to OECD 115 and EU method A.5, GLP study. The value of surface tension of tested substance is 72.4 mN/m at 20ºC and concentration of 1 g/L.

Key value for chemical safety assessment

Surface tension:

72.4

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

1 000

Additional information

Key study: In accordance with OECD guideline 115 and EU method A.5 (GLP study), the surface tension of tested substance was determineted by OECD harmonised ring method at the constant measurement temperature of 20.0ºC. The aqueous solution of test item (concentration of the test item equals 1 g/L) was prepared. Five measurements were performed in vessel placed onto the table of the tensiometer. Calibration was performed using deionised water and obtained calibration factor was used to calculate finally corrected value of surface tension of tested item. The surface tension value of test item is 72.4 mN/m.