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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:
25 April 2007 to 23 August 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Surface tension:
60.7 mN/m
Temp.:
20 °C
Conc.:
1 000 mg/L

An aqueous solution of the test item in de-ionized water with a concentration of 1.0 g/l was prepared.

After solving and tempering for three hours at 20 ± 0.5°C, the measurement of the surface tension with the test item was carried out at 20 ± 0.5°C. Six measurements every minute were performed.

 

Measurement

1

2

3

4

5

6

Time (s)

1048

1108

1168

1229

1289

1349

σ (mN/m)

60.85

60.79

60.72

60.70

60.64

60.60

 

Mean value: σ=60.72 mN/m (corrected by Zuidema and Waters)

Due to the fact that the surface tension is higher than 60 mN/m, the test item has no surface-active properties.

Conclusions:
The surface tension of the aqueous solution at 20°C is σ =60.7 mN/m.
Executive summary:

The purpose of this study was the determination of the surface tension of the test item according to the consolidated version of Council Directive 67/548/EEC Annex V (Council Directive 92/69/EEC), Part A: Methods for the determination of physico-chemical properties, A.5. Surface tension and OECD test guidelines, OECD 115 (1995) Surface tension of aqueous solutions. The study was performed in accordance with the Principles of Good Laboratory Practice (GLP) and reported with a valid GLP certificate.

The method is based on the measurement of the maximum vertical force, which is necessary to separate a ring being in contact with the liquid filled in a measuring cup from the surface of this liquid. Six measurements at a temperature of 20°C ± 0.5 °C were performed every minute with the test item. The standard deviation for the 6 measurements had to be<0.1mN/m.

 

An aqueous solution of the test item in de-ionized water with a concentration of 1.0 g/l was prepared.

After solving and tempering for three hours at 20 ± 0.5°C, the measurement of the surface tension with the test item was carried out at 20 ± 0.5°C. Six measurements every minute were performed.

 

Measurement

1

2

3

4

5

6

Time (s)

1048

1108

1168

1229

1289

1349

σ (mN/m)

60.85

60.79

60.72

60.70

60.64

60.60

 

 

Mean value: σ = 60.72 mN/m (corrected by Zuidema and Waters)

Due to the fact that the surface tension is higher than 60 mN/m, the test item has no surface-active properties.

 

The surface tension of the aqueous solution at 20°C is σ = 60.7 mN/m.

Description of key information

The test item has no surface-active properties.

The surface tension of the aqueous solution at 20°C is σ = 60.7 mN/m.

Key value for chemical safety assessment

Surface tension:
60.7
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension of the test item was determined according to methods A.5. Surface tension and OECD test guidelines, OECD 115 (1995) Surface tension of aqueous solutions. The method is based on the measurement of the maximum vertical force, which is necessary to separate a ring being in contact with the liquid filled in a measuring cup from the surface of this liquid. Six measurements at a temperature of 20°C ± 0.5 °C were performed every minute with the test item. The standard deviation for the 6 measurements had to be,<0.1mN/m.

 An aqueous solution of the test item in de-ionized water with a concentration of 1.0 g/l was prepared.

After solving and tempering for three hours at 20±0.5°C, the measurement of the surface tension with the test item was carried out at 20±0.5°C. Six measurements every minute were performed. The mean value is 60.72 mN/m (corrected by Zuidema and Waters)

Due to the fact that the surface tension is higher than 60 mN/m, the test item has no surface-active properties.

 

The surface tension of the aqueous solution at 20°C is σ = 60.7 mN/m.