9-Octadecenoic acid (Z)-, sulfonated, potassium 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:

May 06, 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according 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:

32.5 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Remarks on result:

other: Arithmetic mean corrected by calibration factor determined via water calibration.

Water calibration: Temp.= 24 °C,O=0.997 g/cm3

Surface tension of purified water
Value 1	71.3 mN/m
Value 2	71.3 mN/m
Value 3	71.3 mN/m
Value 4	71.3 mN/m
Value 5	71.3 mN/m
Value 6	71.3 mN/m
Arithmetic mean	71.3 mN/m
Standard deviation	0.0 mN/m

Arithmetic mean 71.3 mN/m, standard deviation 0.0 mN/m

(Theoretical value: 72.0 mN/m -> correction factor 1.0098)

 

Test substance, first measurement

(c = 995 mg/L), Temp. = 21°C,O= 0.998 g/cm³, age of solution =74 minutes)

Surface tension of solution 1
Value 1	32.6 mN/m
Value 2	32.2 mN/m
Value 3	32.0 mN/m
Value 4	32.0 mN/m
Value 5	31 .7 mN/m
Value 6	31 .7 mN/m
Arithmetic mean	32.0 mN/m
Standard deviation	0.3 mN/m

Arithmetic mean 32.0 mN/m, standard deviation 0.3 mN/m

Test substance, second measurement

(c =1005 mg/L), Temp.=20°C, a =0.998 g/cm³, age of solution =84 minutes)

Surface tension of solution 2
Value 1	33.0 mN/m
Value 2	32.5 mN/m
Value 3	32.4 mN/m
Value 4	32.1 mN/m
Value 5	31 .9 mN/m
Value 6	31 .8 mN/m
Arithmetic mean	32.3 mN/m
Standard deviation	0.5 mN/m

Arithmetic mean 32.3 mN/m, standard deviation 0.5 mN/m

 

Temperature differences were considered by entry of the density.

-Arithmetic mean of two test solutions: 32.2 mN/m (± 0.2 mN/m)

-Arithmetic mean corrected by calibration factor determined via water calibration: 32 .5 mN/m

For the determination concentrations of 1 g/L were dissolved in water. The automatic measurement was initiated. The measurement was completed after 300 seconds

Conclusions:

Under the study conditions, the surface tension (Harkins-Jordan corrected) of the test substance at 20°C is 32 .5 mN/m.

Executive summary:

A study was conducted to determine the surface tension of the test substance according to OECD Guideline 105 and EU Method A.5. The determination of the surface tension was carried out by the ring method with an aqueous solution of the test substance at a concentration of 1,000 mg/L. Under the study conditions, the surface tension (Harkins-Jordan corrected) of the test substance at 20°C is 32 .5 mN/m (Kintrup, 2013).

Description of key information

The surface tension was determined according to OECD Guideline 105 and EU Method A.5 (Kintrup, 2013).

Key value for chemical safety assessment

Surface tension:

32.5

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

1 000