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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:
5 July 2016
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:
34.5 mN/m
Temp.:
20 °C
Conc.:
1 000 mg/L

Details:

Water calibration:

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

Surface tension of purified water, mN/m

Value 1

71.7

Value 2

71.7

Value 3

71.7

Value 4

71.7

Value 5

71.8

Value 6

71.7

Arithmetic mean

 71.7

Standard deviation

 0.0

Arithmetic mean 71.7 mN/m, standard deviation 0.0 mN/m from the last 6 measurements (theoretical value: 72.4 mN/m →correction factor 1.0098)

First test solution

(c = 1029 mg/L), Temp. = 20 °C, density = 0.998 g/cm³, age of solution = 206 min)

Surface tension of solution 1, mN/m

Value 1

34.1

Value 2

34.2

Value 3

34.1

Value 4

34.1

Value 5

34.1

Value 6

34.2

 Arithmetic mean  34.1
 Standard deviation  0.1

Arithmetic mean 34.1 mN/m, standard deviation 0.1 mN/m from 6 measurements

Second test solution

 (c = 1128 mg/L), Temp. = 20 °C, density = 0.998 g/cm³, age of solution = 282 min)

Surface tension of solution 2, mN/m

Value 1

34.2

Value 2

34.2

Value 3

34.2

Value 4

34.1

Value 5

34.1

Value 6

34.2

 Arithmetic mean  34.2
 Standard deviation  0.0

Arithmetic mean 34.2 mN/m, standard deviation 0.0 mN/m from 6 measurements

Arithmentic mean of two test solutions:                    34.2 mN/m (+ 0.1 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            34.5 mN/m

Description of key information

34.5 mN/m at 20 °C and concentration 1 g/L (EU A.5)

Key value for chemical safety assessment

Surface tension:
34.5
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The substance is surface active.