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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:
16 Aug 2012
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:
32.8 mN/m
Temp.:
22 °C
Conc.:
1 000 mg/L

Details:

Water calibration:

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

Surface tension of purified water, mN/m

Value 1

71.6

Value 2

71.6

Value 3

71.6

Value 4

71.6

Value 5

71.5

Value 6

71.5

Arithmetic mean

71.6

Standard deviation

0.0

Arithmetic mean 71.1 mN/m, standard deviation 0.0 mN/m (theoretical value: 72.0 mN/m →correction factor 1.0056)

First test solution

(c = 1005.0 mg/L), Temp. = 22 °C, σ = 0.998 g/cm3, age of solution = 32 min)

Surface tension of solution 1, mN/m

Value 1

32.9

Value 2

32.7

Value 3

32.6

Value 4

32.6

Value 5

32.4

Value 6

32.4

 Arithmetic mean  32.6
 Standard deviation  0.2

Arithmetic mean 32.6 mN/m, standard deviation 0.2 mN/m

Second test solution

 (c = 1.005 mg/L), Temp. = 22 °C, σ = 0.997 g/cm3, age of solution = 39 min)

Surface tension of solution 2, mN/m

Value 1

32.8

Value 2

32.7

Value 3

32.5

Value 4

32.6

Value 5

32.4

Value 6

32.4

Arithmetic mean

32.6

 Standard deviation  0.2

Arithmetic mean 32.6 mN/m, standard deviation 0.2 mN/m

By adjusting the temperature setting of the tensiometer, differences in the density of the liquid can be compensated automatically.

Arithmentic mean of two test solutions:                    32.6 mN/m (+ 0.0 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            32.8 mN/m

The sample was dissolved in water and tempered at 20 °C. Then the automatic measurement was initiated. The measurement was completed after 250 seconds.

The surface tension was determined at a concentration of 1 g/L.

Conclusions:
The substance is surface active.

Description of key information

32.8 mN/m at 22 °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.