Reaction mass of N-(2-hydroxypropyl)decan-1-amide and N-(2-hydroxypropyl)octanamide

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 June 20, 2017 to June 22, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

equivalent or similar 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:

not specified

Type of method:

ring method

Key result

Surface tension:

29 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Water calibration: Temp. = 21°C, p = 0.998 g/cm³

Result of calibration: Arithmetic mean 71.5 mN/m, standard deviation 0.1 mN/m from 6 measurements (theoretical value: 72.4 mN/m -> correction factor 1.0126)

First test solution: c = 984.9 mg/I, Temp. = 22°C, p = 0.998 g/cm³, age of the solution: 240 min

Result 1: Arithmetic mean 27.3 mN/m, standard deviation 0.1 mN/m from 6 measurements

Second test solution: c = 1082 mg/1, Temp. = 21°C, p= 0.998 g/cm³, age of the solution: 298 min

Result 2: Arithmetic mean 29.9 mN/m, standard deviation 0.0 mN/m from 6 measurements

 

Arithmetic mean of two test solutions: 28.6 mN/m (± 1.8 mN/m)

Arithmetic mean corrected by calibration factor determined via water calibration: 29.0 mN/m

Conclusions:

Under the study conditions, the surface tension of the test substance was established at 29.0 mN/m.

Executive summary:

A study was conducted to determine the surface tension of the test substance using ring method according to EU Method A.5 similar to OECD Guideline 115. The two samples were prepared by dissolving the test substance into water at 1 g/L. The test solutions were conditioned for 0.5 h in an ultrasonic bath and tempered at 20°C. The solutions were light cloudy. Then the automatic measurement was initiated. The average of 6 single measurements was determined per solution. In this case the total measuring time was more than 3000 s per solution. Arithmetic mean was corrected by calibration factor determined via water calibration. Under the study conditions, the surface tension of the test substance was established at 29.0 mN/m (Kintrup, 2017).

Description of key information

The surface tension was determined according to EU Method A.5 and similar to OECD Guideline 115 (Kintrup, 2017).

Key value for chemical safety assessment

Surface tension:

29