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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:
03 August 2005
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
1992
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
72 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Calibration

Mean surface-tension of demineralised water: 79.2 ± 0.2 mN/m

Calibration factor φb = (σo / σg): 0.919

Where

σo = 72.75 mN/m (surface tension of water at 20.0 °C; value given in the literature)

σg = 79.2 mN/m (measured surface tension of demineralised water at 20.3 °C)

 

Test Material

The surface tension of a 1 g/L solution of the test material was determined to be 72.0 ± 0.4 mN/m (corrected value). Results are presented in Tables 1 and 2.

The test material was not considered to be surface active.

 

Reference Material

Results: 32.0 ± 0.2 mN/m

Conformity: Yes

 

Table 1: Results from Assays 1 to 3

Time

Surface Tension (mN/m)

Assay 1 (20.4 °C)

T0

76.1

T0 + 2 minutes

78.2

T0 + 5 minutes

78.2

T0 + 12 minutes

78.2

Assay 2 (20.5 °C)

T0

78.8

T0 + 3 minutes

78.8

T0 + 6 minutes

78.8

Assay 3 (20.4 °C)

T0

78.3

T0 + 2 minutes

78.2

T0 + 5 minutes

78.3

T0 + 7 minutes

78.3

 

Table 2: Calculation

Assay

Measurements (mN/m)

Correction using φb (mN/m)

Correction according to Harkins & Jordan table (mN/m)

State of equilibrium

1

78.2

72.0

72.0

2

78.8

3

78.3

Mean

78.4

 

Conclusions:
Under the conditions of this study, the surface tension of a 1 g/L solution of the test material was determined to be 72.0 ± 0.4 mN/m (corrected value). The test material is not considered to be surface active.
Executive summary:

The surface tension of the test material was determined in accordance with the standardised guidelines OECD 115 and EU Method A.5 under GLP conditions using the ring method.

A 1 g/L solution was used for testing as the water solubility of the test material was higher than 1 g/L. 0.5016 g of test material was weighed and dissolved in demineralised water up to 500 mL. The test material solution was stirred magnetically for 1 h and 15 min before being tested.

The measurements were performed in a thermo-regulated room at about 20 °C. Several measurements are made at various times. If the variations are lower than or equal to 2 %, the state of equilibrium is considered as reached.

Determination of the calibration factor (b) of the apparatus was carried out with demineralised water. Correction of the mean of the measured values (mN/m) were made by multiplication with the calibration factor Φb. The measured surface tension values were further corrected on the basis of the Harkins-Jordan correction.

Under the conditions of this study, the surface tension of a 1 g/L solution of the test material was determined to be 72.0 ± 0.4 mN/m (corrected value). The test material is not considered to be surface active.

Description of key information

Under the conditions of this study, the surface tension of a 1 g/L solution of the test material was determined to be 72.0 ± 0.4 mN/m (corrected value). The test material is not considered to be surface active.

Key value for chemical safety assessment

Surface tension:
72
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension of the test material was determined in accordance with the standardised guidelines OECD 115 and EU Method A.5 under GLP conditions using the ring method. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

A 1 g/L solution was used for testing as the water solubility of the test material was higher than 1 g/L. 0.5016 g of test material was weighed and dissolved in demineralised water up to 500 mL. The test material solution was stirred magnetically for 1 h and 15 min before being tested.

The measurements were performed in a thermo-regulated room at about 20 °C. Several measurements are made at various times. If the variations are lower than or equal to 2 %, the state of equilibrium is considered as reached.

Determination of the calibration factor (b) of the apparatus was carried out with demineralised water. Correction of the mean of the measured values (mN/m) were made by multiplication with the calibration factor Φb. The measured surface tension values were further corrected on the basis of the Harkins-Jordan correction.

Under the conditions of this study, the surface tension of a 1 g/L solution of the test material was determined to be 72.0 ± 0.4 mN/m (corrected value). The test material is not considered to be surface active.