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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:
2016-02-23 to 2016-02-24
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
GLP compliance:
no
Type of method:
ring method
Key result
Surface tension:
> 60 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: Not surface-active.

Results
Table 1 – Surface tension results

Measurement

1

2

3

4

5

6

Time [s]

31

93

155

216

278

340

σ[mN/m] uncorrected

77.85

77.80

77.78

77.74

77.70

77.66

σ[mN/m] corrected according to Zuidema and Waters1

72.35

72.30

72.28

72.24

72.19

72.16

1Zuidema, H., Waters, C.W., Ind. Eng. Chem. Analyt. 13 (1941), p312

The surface tension showed a time-dependence, thus no mean value could be reported. It was > 60 mN/m (20 °C) , therefore the test item has no surface active properties.

Conclusions:
The surface tension of the aqueous solution of the test item at 20 °C was higher than 60 mN/m. The test item had no surface­ active properties.
Executive summary:

The surface tension was determined according to OECD 115 and A.5. European Commission Regulation (EC) No. 440/2008 using the ring method. 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. Due to the fact that the surface tension showed a time-dependence no mean value could be reported. However, the surface tension of the aqueous solution of the test item at 20 °C was higher than 60 mN/m. The test item had no surface­ active properties.

Description of key information

The surface tension of the aqueous solution of the test item at 20 °C was higher than 60 mN/m. The test item had no surface­ active properties.

Key value for chemical safety assessment

Additional information

The surface tension was determined according to OECD 115 and A.5. European Commission Regulation (EC) No. 440/2008 using the ring method. 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. Due to the fact that the surface tension showed a time-dependence no mean value could be reported. However, the surface tension of the aqueous solution of the test item at 20 °C was higher than 60 mN/m. The test item had no surface­ active properties.