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Physical & Chemical properties

Surface tension

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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:
reference to same study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to
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)