TEA-Esterquat

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02 December 2020 - 08 March 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: Critical Micelle Concentration: Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995.

GLP compliance:

yes

Type of method:

other: Critical Micelle Concentration; ring method

Key result

Water solubility:

51.3 mg/L

Conc. based on:

test mat.

Temp.:

20 °C

pH:

>= 3.8 - <= 3.9

Remarks on result:

other:

Line 1 was generated from linear regression of five sample solution concentrations for which the surface tension was shown to be concentration dependent and Line 2 was

generated from linear regression of three sample solution concentrations for which the surface tension was observed to be essentially independent of concentration. The intersection

of these two lines gave the critical micelle concentration and was calculated by solving the two equations:

Line 1 equation: y = -15.5x + 62.1

Line 2 equation: y = -1.86x + 38.7

The sample solution at 100.2 mg/L was not used in generating the two lines. At this concentration the surface tension appeared to be transitioning to Line 2 at a shallower

gradient than Line 1.

The sample solutions at 0.1002 mg/L were not used in generating the two lines. At this concentration the surface tension was only slightly affected and was approaching that of

purified water.

The CMC was determined to be 51.3 mg/L.

The critical micelle concentration (CMC) is an important characteristic of a surfactant. At low concentrations of surfactant, the surface tension of water is only slightly affected.

Increasing the concentration but before reaching the CMC, the surface tension changes significantly. After reaching the CMC and above, the surface tension remains relatively

constant or changes with a much more gradual slope.

Below the CMC, a surfactant is considered to be thermodynamically soluble in the water; whereas above the CMC, the solubility of a surfactant in water has been exceeded and the excess surfactant aggregates to form micelles. These micelles have significantly less effect on the surface tension of a solution and are considered not to be in solution. Thus, the water solubility of a surfactant may be expressed in terms of the CMC.

Conclusions:

The CMC sterification products of triglycerides C18 unsaturated with triethanolamine, dimethyl sulfate quaternized was determined to be 51.3 mg/L at 20.0 ± 0.5 °C (OECD TG 115/EU method A.5).

Executive summary:

The Critical Micelle Concentration of Esterification products of triglycerides C18 unsaturated with triethanolamine, dimethyl sulfate quaternized was determined by measuring the surface tension of a range of aqueous sample solutions of differing concentration accodring to Method A.5 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 CMC was determined to be 51.3 mg/L at 20.0 ± 0.5 °C.

Description of key information

CMC = 51.3 mg/L at 20.0 ± 0.5 °C (OECD TG 115/EU method A.5)

Key value for chemical safety assessment

Water solubility:

51.3 mg/L

at the temperature of:

20 °C

Additional information

The Critical Micelle Concentration of Esterification products of triglycerides C18 unsaturated with triethanolamine, dimethyl sulfate quaternized was determined by measuring the surface tension of a range of aqueous sample solutions of differing concentration accodring to Method A.5 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 CMC was determined to be 51.3 mg/L at 20.0 ± 0.5 °C.