Alcohols, C10-16, ethoxylated, sulfates, mono(hydroxyethyl)ammonium 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:

5 July 2016

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:

no

Type of method:

ring method

Surface tension:

34.5 mN/m

Temp.:

20 °C

Conc.:

1 000 mg/L

Details:

Water calibration:

Water calibration: Temp. = 20 °C, density = 0.998 g/cm³

Surface tension of purified water, mN/m
Value 1	71.7
Value 2	71.7
Value 3	71.7
Value 4	71.7
Value 5	71.8
Value 6	71.7
Arithmetic mean	71.7
Standard deviation	0.0

Arithmetic mean 71.7 mN/m, standard deviation 0.0 mN/m from the last 6 measurements (theoretical value: 72.4 mN/m →correction factor 1.0098)

First test solution

(c = 1029 mg/L), Temp. = 20 °C, density = 0.998 g/cm³, age of solution = 206 min)

Surface tension of solution 1, mN/m
Value 1	34.1
Value 2	34.2
Value 3	34.1
Value 4	34.1
Value 5	34.1
Value 6	34.2
Arithmetic mean	34.1
Standard deviation	0.1

Arithmetic mean 34.1 mN/m, standard deviation 0.1 mN/m from 6 measurements

Second test solution

 (c = 1128 mg/L), Temp. = 20 °C, density = 0.998 g/cm³, age of solution = 282 min)

Surface tension of solution 2, mN/m
Value 1	34.2
Value 2	34.2
Value 3	34.2
Value 4	34.1
Value 5	34.1
Value 6	34.2
Arithmetic mean	34.2
Standard deviation	0.0

Arithmetic mean 34.2 mN/m, standard deviation 0.0 mN/m from 6 measurements

Arithmentic mean of two test solutions:                    34.2 mN/m (+ 0.1 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            34.5 mN/m

Description of key information

34.5 mN/m at 20 °C and concentration 1 g/L (EU A.5)

Key value for chemical safety assessment

Surface tension:

34.5

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

1 000

Additional information

The substance is surface active.