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Diss Factsheets

Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
7 Mar 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
no
Type of method:
ring method
Surface tension:
34 mN/m
Temp.:
21 °C
Conc.:
1 g/L

Details:

Water calibration:

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

Surface tension of purified water, mN/m

Value 1

71.3

Value 2

71.2

Value 3

71.2

Value 4

71.2

Value 5

71.2

Value 6

71.2

Arithmetic mean

71.2

Standard deviation

0.1

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 = 1000.5 mg/L), Temp. = 21 °C, σ = 0.998 g/cm3, age of solution = 38 min)

Surface tension of solution 1, mN/m

Value 1

33.2

Value 2

33.2

Value 3

33.1

Value 4

33.1

Value 5

33.2

Value 6

33.2

Arithmetic mean

33.2

Standard deviation

0.0

Arithmetic mean 33.2 mN/m, standard deviation 0.0 mN/m

Second test solution

(c = 1007.0 mg/L), Temp. = 21 °C, σ = 0.998 g/cm3, age of solution = 45 min)

Surface tension of solution 2, mN/m

Value 1

34.5

Value 2

34.4

Value 3

34.2

Value 4

34.1

Value 5

34.2

Value 6

34.1

Value 7

34.1

Value 8

34.1

 Arithmetic mean  34.1
 Standard deviation  0.1

Arithmetic mean 34.1 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:                    33.65 mN/m (+ 0.45 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            34.03 mN/m

The sample was dissolved in water and tempered at 20 °C. Then the automatic measurement was initiated. The measurement was completed after 200 seconds.

The surface tension was determined as a concentration of 1 g/L. The water solubility is unlimited. The solutions were clear and without any turbidity.

Description of key information

34.0 mN/m at 21 °C, concentration 1 g/L

Key value for chemical safety assessment

Additional information

The surface tension was determined by the ring method according to EU test method A.5. (similar to OECD 115).

The substance should be regarded as being surface active material.