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Surface tension

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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.