Alcohols, C16-18 and C18-unsatd., ethoxylated, sulfates, sodium 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:

2 Sep 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

GLP compliance:

yes

Type of method:

ring method

Surface tension:

29.6 mN/m

Temp.:

21 °C

Conc.:

1 000 mg/L

Details:

Water calibration:

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

Surface tension of purified water, mN/m
Value 1	71.8
Value 2	71.9
Value 3	71.8
Value 4	71.9
Value 5	71.9
Value 6	71.9
Arithmetic mean	71.9
Standard deviation	0.0

Arithmetic mean 71.9 mN/m, standard deviation 0.0 mN/m from the last 6 measurements (theoretical value: 72.4 mN/m →correction factor 1.007)

First test solution

(c = 1143.0 mg/L), Temp. = 21 °C, density = 0.998 g/cm³, age of solution = 46 min)

Surface tension of solution 1, mN/m
Value 1	29.1
Value 2	28.6
Value 3	29.1
Value 4	28.0
Value 5	28.5
Value 6	28.0
Arithmetic mean	28.5
Standard deviation	0.5

Arithmetic mean 28.5 mN/m, standard deviation 0.5 mN/m from 6 measurements

Second test solution

 (c = 913 mg/L), Temp. = 20 °C, density = 0.998 g/cm³, age of solution = 71 min)

Surface tension of solution 2, mN/m
Value 1	30.4
Value 2	29.9
Value 3	30.1
Value 4	29.9
Value 5	29.5
Value 6	29.8
Arithmetic mean	30.0
Standard deviation	0.3

Arithmetic mean 30.0 mN/m, standard deviation 0.3 mN/m from 6 measurements

Third test solution

 (c = 1013 mg/L), Temp. = 21 °C, density = 0.998 g/cm³, age of solution = 104 min)

Surface tension of solution 3, mN/m
Value 1	30.4
Value 2	30.0
Value 3	29.8
Value 4	29.6
Value 5	29.0
Value 6	29.6
Arithmetic mean	29.7
Standard deviation	0.5

Arithmetic mean 29.7 mN/m, standard deviation 0.5 mN/m from 6 measurements

By adjusting the temperature setting of the tensiometer, differences in the density of the liquid can be compensated automatically.

Arithmentic mean of three test solutions:                    29.4 mN/m (+ 0.8 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            29.6 mN/m

Description of key information

29.6 mN/m at 20-21 °C, concentration: 1 g/L (EU A.5)

Additional information

The surface tension was determined by the ring method.

The substance should be regarded as being surface active material.