Quaternary ammonium compounds, N,N,N'-tris(hydroxyethyl)-N,N'-dimethyl-N'-C16-18 (even numbered) and C18 unsatd., alkyltrimethylenedi-, bis(Me sulfates) (salts)

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From October 27, 2016 to July 03, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: UNE 55-50

Deviations:

no

GLP compliance:

not specified

Type of method:

plate method

Key result

Surface tension:

31.75 mN/m

Temp.:

25 °C

Conc.:

4.32 mg/L

Remarks on result:

other: Surface active substance

Results:

Sample concentration (mg/l) 4.32

Surface tension (mN/m) 31.75

The calculation of surface tension of a concentration of 4.32mg/L (90% of CMC) is carried out using the regression line obtained in Critical Micelle Concentration (CMC) determination.

y = -11,929x + 39,325

Where x belongs to log 4.32 = 0.635

y = -(11,929*0.635) + 39,325 = 31.750 mN/m

Conclusions:

Under the study conditions, surface tension of the test substance determined to be 31.750 mN/m at the concentration of 4.32 mg/L at 25ºC.

Executive summary:

A study was conducted to determine the surface tension of the test substance, Quaternary ammonium compounds, N,N,N'-tris(hydroxyethyl)-N,N'-dimethyl-N'-tallow alkyltrimethylenedi-, bis(Me sulfates) (salts), using the tensiometer kruss standard plate method according to the OECD Guideline 115. The critical micelle concentration (CMC) of the substance is 4.8 mg/L. According to guideline, the preparation and handling of the sample should be a solution of the substance in distilled water in a concentration of 90% of the saturation solubility 90% of the CMC (4.8 mg/L) is 4.32 mg/L. The calculation of surface tension of a concentration of 4.32 mg/L (90% of CMC) is carried out using the regression line obtained in Critical Micelle Concentration (CMC) determination. Under the study conditions, surface tension of the test substance determined to be 31.750 mN/m at the concentration of 4.32 mg/L at 25ºC. Therefore, the test substance was considered to be surface-active (Ventura, 2017).

Description of key information

The surface tension was determined method according to OECD Guideline 115 (Ventura, 2017).

Key value for chemical safety assessment

Surface tension:

31.75

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

4.32

Additional information

(Surface active)