Quaternary ammonium compounds, di-C14-18-alkyldimethyl, Me sulfates

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-09-22 to 2016-09-23

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)

Version / remarks:

adopted 27 July, 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

30 May, 2008

Deviations:

no

GLP compliance:

no

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

ring method

Key result

Surface tension:

37.4 mN/m

Temp.:

20 °C

Conc.:

0.2 g/L

Table 1: Results 

	First run		Second run
Number of measurements	139		126
Total measuring time [min:s]	46:07		41:53
Measuring time of the last 10 measurements [min:s]	03:05		03:08
Measurement 1	38.24		37.26
Measurement 2	38.20		37.23
Measurement 3	38.17		37.19
Measurement 4	38.13		37.16
Measurement 5	38.10		37.12
Measurement 6	38.06		37.09
Measurement 7	38.03		37.05
Measurement 8	37.99		37.02
Measurement 9	37.96		36.98
Measurement 10	37.92		36.95
Surface tension [mN/m]^1)	37.89		36.92
Mean value [mN/m]		37	.4

¹⁾Mean value of the last ten measurements

Conclusions:

A solution with a concentration of 0.2 g/L of Di-C14-18 alkyldimethyl ammonium methosulfate exhibits a surface tension of 37.4 mN/m, thus, the substance is surface active.

Executive summary:

The present test was conducted according to OECD test guideline 115 (adopted 27 July, 1995) and EU test method A.5 (30 May, 2008) in order to determine the surface tension of Di-C14 -18 alkyldimethyl ammonium methosulfate.

The method used is based on the measurement of the maximum force which is necessary to exert vertically on a ring, in contact with the surface of the liquid, in order to separate it from the surface. 0.200 g of the test item were dissolved in 1000 mL deionized water, for each run approx. 30 mL of the solution were transferred into a glass vessel; measurements were repeated until a constant surface tension value was reached (i.e. when the standard deviation of the last ten measurements was smaller then 0.1 mN/m). The mean value of the last ten measurements was recorded. The surface tension of the substance was determined to be 37.4 mN/m, thus, the substance is surface active.

Description of key information

37.4 mN/m at 0.2 g/L (OECD TG 115/EU method A.5; ring method)

Key value for chemical safety assessment

Surface tension:

37.4

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

200

Additional information

The present test was conducted according to OECD test guideline 115 (adopted 27 July, 1995) and EU test method A.5 (30 May, 2008) in order to determine the surface tension of Di-C14 -18 alkyldimethyl ammonium methosulfate.

The method used is based on the measurement of the maximum force which is necessary to exert vertically on a ring, in contact with the surface of the liquid, in order to separate it from the surface. 0.200 g of the test item were dissolved in 1000 mL deionized water, for each run approx. 30 mL of the solution were transferred into a glass vessel; measurements were repeated until a constant surface tension value was reached (i.e. when the standard deviation of the last ten measurements was smaller then 0.1 mN/m). The mean value of the last ten measurements was recorded. The surface tension of the substance was determined to be 37.4 mN/m, thus, the substance is surface active.