Sulfuric acid, mono-C12-14-alkyl esters, magnesium 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:

27 Jan 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:

no

Type of method:

ring method

Surface tension:

31.5 mN/m

Temp.:

20.5 °C

Conc.:

1 g/L

Remarks on result:

other: mean temperature of two measurements

Details:

Water calibration:

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

Surface tension of purified water [mN/m]
Value 1	71.9
Value 2	72.0
Value 3	72.0
Value 4	72.1
Value 5	72.0
Arithmetic mean	72.0
Standard deviation	0.1

Arithmetic mean 72.0 mN/m, standard deviation 0.01 mN/m (theoretical value: 72.4 mN/m →correction factor 1.0056)

First test solution

(c = 0.957 g/L, Temp. = 21 °C, density = 0.998 g/cm³, age of solution = 42 min)

Surface tension of the solution [mN/m]
Value 1	30.9
Value 2	30.9
Value 3	30.9
Value 4	30.9
Value 5	30.9
Arithmetic mean	30.9
Standard deviation	0.0

Arithmetic mean 30.9 mN/m, standard deviation 0.0 mN/m

Second test solution

 (c = 1.03 g/L, Temp. = 20 °C, density = 0.998 g/cm³, age of solution = 60 min)

Surface tension of the solution [mN/m]
Value 1	31.8
Value 2	31.8
Value 3	31.8
Value 4	31.8
Value 5	31.8
Arithmetic mean	31.8
Standard deviation	0.0

Arithmetic mean 31.8 mN/m, standard deviation 0.0 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:                    31.4 mN/m (+ 0.6 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            31.5 mN/m

Description of key information

31.5 mN/m at 20.5 °C, concentration 1 g/L  

Key value for chemical safety assessment

Surface tension:

31.5

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

1 000

Additional information

The surface tension was determined by the ring method according to EU test method A.5. The substance is surface active.