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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 Oct 2016 - 13 Mar 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study conducted in accordance with international guidelines and in accordance with GLP. All relevant validity criteria were met.
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Key result
Surface tension:
41.05 mN/m
Temp.:
20 °C
Remarks on result:
other: Concentration based on diluted saturated solution

The determination was carried out in ten successive measurements with a standard deviation <=0.05mN/m. Table 1 demonstrates the results. The density of the test solution was determined in a preliminary measurement via buoyancy method to be 1.004g/cm3 (20.4  °C). This density was used for the subsequently obtained surface tension values (correciton method Harkins and Jordan for the ring method, automatically acocunted for by the tensiometer software).

Table 1. Surface tension, temperature

MEASUREMENT NO. (of last 10 measurements)

TIME (from transfer of test solution into test vessel until end of each measurement) (min)

TIME (from start of measurement until end of each measurement)

(min)

SURFACE TENSION (mN/m)

TEMPERATURE

(°C)

1

61.9

8.3

41.14

20.3

2

62.6

9.0

41.10

20.3

3

63.3

9.6

41.10

20.3

4

63.9

10.2

41.05

20.3

5

64.6

10.9

41.07

20.3

6

65.2

11.5

41.02

20.3

7

65.8

12.2

41.00

20.3

8

66.6

12.9

41.06

20.4

9

67.2

13.6

41.00

20.4

10

67.9

14.2

41.00

20.4

Mean

-

-

41.05

20.3

SD (±)

-

-

0.05

0.05

The surface tension of a 90% saturated aqueous solution of the test substance was determined at 20°C to be 41.05mN/m (standard deviation±0.05mN/m).

Conclusions:
The surface tension of a 90% saturated aqueous solution of the test substance was determined at 20°C to be 41.05mN/m (standard deviation ±0.05mN/m).
Executive summary:

Determination of the surface tension of the test substance was conducted via tensiometer using the EU Method A.5 and OECD Guideline no. 115 harmonized ring method, which is based on the standards ISO 304-1985, DIN 53914, ASTM-D-1590 and ASTM-D-1331.

After the tensiometer program had been started, the test vessel was automatically raised by the tensiometer until the ring was immersed below the surface of the test solution. The table top was lowered at a rate of 5mm/min until the maximum force was reached (without seperation of the attached liquid layer from the ring). This applied force was automatically performed until a constant surface tension value was reached over 10 consecutive measurements.

The surface tension of a 90% saturated aqueous solution of the test substance was determined at 20°C to be 41.05mN/m (standard deviation ±0.05mN/m). Considering that distilled water has a surface tension of 72.75mN/m at 20°C and the tested substance showed a surface tension lower than 60mN/m under the conditions of the referring method, the substance should be regarded as being a surface-active material.

Description of key information

Surface Tension = 41.05 mN/m (±0.05 mN/m); OECD 115; Anon, 2017

Key value for chemical safety assessment

Surface tension:
41.05

Additional information

In a single key study, determination of the surface tension of the test substance was conducted via tensiometer using the EU Method A.5 and OECD Guideline no. 115 harmonized ring method, which is based on the standards ISO 304-1985, DIN 53914, ASTM-D-1590 and ASTM-D-1331.

After the tensiometer program had been started, the test vessel was automatically raised by the tensiometer until the ring was immersed below the surface of the test solution. The table top was lowered at a rate of 5mm/min until the maximum force was reached (without separation of the attached liquid layer from the ring). This applied force was automatically performed until a constant surface tension value was reached over 10 consecutive measurements.

The surface tension of a 90% saturated aqueous solution of the test substance was determined at 20°C to be 41.05mN/m (standard deviation ±0.05mN/m). Considering that distilled water has a surface tension of 72.75mN/m at 20°C and the tested substance showed a surface tension lower than 60mN/m under the conditions of the referring method, the substance should be regarded as being a surface-active material.

However, consistent with discussion and conclusions presented in IUCLID Section 4.8 (water solubility), the reduction in surface tension is believed to be driven by a surface-active impurity or minor transformation product. the registered substance is not considered to be a true surfactant substance.

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