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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:
from 2017-05-15 to 2017-06-12
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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
no
Type of method:
ring method
Key result
Surface tension:
57.3 mN/m
Temp.:
20 °C
Conc.:
22.4 mg/L

Table 1. Surface tension

Measurement

1

2

3

4

5

6

Time (s)

1248

1359

1490

1610

1731

1851

σ (mN/m) uncorrected

62.58

62.62

62.61

62.74

62.71

62.70

σ (mN/m) corrected according to Zuidema and Waters

57.17

57.20

57.19

57.33

57.30

57.29

Mean value: σ = 57.3 mN/m (corrected)

The aqueous solution of the test item had a mean surface tension of 57.3 mN/m. As the surface tension was lower than 60 mN/m, the test item had surface-active properties.

Conclusions:
The surface tension of the aqueous solution at 20 °C had a mean values of 57.3 mN/m. The test item had surface-active properties.
Executive summary:

A study was conducted according to OECD TG 115 and Regulation (EC) No 440/2005 Part A, A.5 to determine the surface tension of an aqueous solution of the test item using the ring method. Therefore, a solution of the test substance in de-ionised water was prepared at a concentration of 22.4 mg/L and was stirred for 116 h. After the stirring period there was still undissolved test item in the solution, an aliquot of the lower layer was taken and diluted to 90 %. After adapting to 20 °C the measurement was started and repeated antil six measurements were withing the limits of the stability criterion. The surface tension was determined to be 57.3 mN/m at 20 °C. It was considered that the test item is surface active (surface tension < 60 mN/m).

Description of key information

The surface tension of the aqueous solution at 20 °C had a mean values of 57.3 mN/m. The test item had surface-active properties.

Key value for chemical safety assessment

Surface tension:
57.3
in mN/m at 20°C and concentration in mg/L:
22.4

Additional information

A study (reference 4.10-1) was conducted according to OECD TG 115 and Regulation (EC) No 440/2005 Part A, A.5 to determine the surface tension of an aqueous solution of the test item using the ring method. Therefore, a solution of the test substance in de-ionised water was prepared at a concentration of 22.4 mg/L and was stirred for 116 h. After the stirring period there was still undissolved test item in the solution, an aliquot of the lower layer was taken and diluted to 90 %. After adapting to 20 °C the measurement was started and repeated antil six measurements were withing the limits of the stability criterion. The surface tension was determined to be 57.3 mN/m at 20 °C. It was considered that the test item is surface active (surface tension < 60 mN/m).