Alcohols, C9-11, branched and linear, ethoxylated, sulfates, 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:

19 Apr 2012

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:

33 mN/m

Temp.:

23 °C

Conc.:

1 g/L

Details:

Water calibration:

Water calibration: Temp. = 25 °C, σ = 0.997 g/cm³

Surface tension of purified water, mN/m
Value 1	71.0
Value 2	70.9
Value 3	71.0
Value 4	71.0
Value 5	71.0
Value 6	70.9
Arithmetic mean	71.0
Standard deviation	0.0

Arithmetic mean 71.0 mN/m, standard deviation 0.0 mN/m (theoretical value: 71.8 mN/m →correction factor 1.0113)

First test solution

(c = 1001.6 mg/L), Temp. = 23 °C, σ = 0.997 g/cm³, age of solution = 49 min)

Surface tension of solution 1, mN/m
Value 1	33.0
Value 2	32.5
Value 3	32.5
Value 4	32.3
Value 5	32.3
Value 6	32.4
Arithmetic mean	32.5
Standard deviation	0.3

Arithmetic mean 32.5 mN/m, standard deviation 0.3 mN/m

Second test solution

 (c = 1013.6 mg/L), Temp. = 23 °C, σ = 0.997 g/cm³, age of solution = 58 min)

Surface tension of solution 2, mN/m
Value 1	33.1
Value 2	32.8
Value 3	32.7
Value 4	32.7
Value 5	32.8
Value 6	32.7
Arithmetic mean	32.8
Standard deviation	0.1

Arithmetic mean 32.8 mN/m, standard deviation 0.1 mN/m

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

Arithmetic mean of two test solutions:                    32.7 mN/m (+ 0.2 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            33.0 mN/m

The sample was dissolved in water and tempered at 20 °C. Then the automatic measurement was initiated. The measurement was completed after 2000 seconds.

The surface tension was determined as a concentration of 1 g/L.

Description of key information

The surface tension is 33.0 mN/m at 23 °C at a concentration of 1 g/L.  

Additional information

The surface tension was determined by the ring method according to EU Method A.5. The substance should be regarded as being surface active.