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Physical & Chemical properties

Surface tension

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Administrative data

Endpoint:
surface tension
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
Study period:
2013-05-21 to 2013-05-22
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report Date:
2013

Materials and methods

Test guidelineopen allclose all
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)
Remarks:
signed 2010-10-20
Type of method:
OECD harmonised ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: crystalline
Details on test material:
- Name of test material (as cited in study report): Potassium 2-ethylhexanoate
- Molecular formula: C8H15KO2
- Molecular weight: 182.30 g/mol
- Physical state: Off-white crystalline solid
- Stability under test conditions: Assumed to be stable
- Storage condition of test material: Sealed from atmosphere at room temperature

Results and discussion

Surface tension
Surface tension:
47.63 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: standard deviation of 0.05 mN/m

Any other information on results incl. tables

Determination of the density

The density of the1 g/L aqueous solution of potassium 2-ethylhexanoate in double distilled water was determined in a preliminary measurement to be 1.012 g/cm³ (20.2 °C).

Temperature

The temperature range of the test solution during the whole measurements was 19.9 - 20.2 °C

The room temperature during these measurements was 19.6 - 20.5 °C

Time line of the study

After transfer of the test solution into the test vessel 110.9 minutes were needed to reach equilibrium at which 10 successive measurements with a standard deviation of 0.05 mN/m were possible

Surface tension of a 1 g/L aqueous solution of potassium 2-ethylhexanoate

The determination was carried out in ten successive measurements with a standard deviation ≤ 0.05 mN/m.  

Measurement

no.*

Time**

[min]

Surface tension***

[mN/m]

Temperature *

[°C]

1

104.5

47.72

19.9

2

105.3

47.68

20.0

3

106.0

47.66

20.0

4

106.7

47.64

20.0

5

107.4

47.60

20.0

6

108.1

47.63

20.0

7

108.8

47.61

19.9

8

109.5

47.62

20.0

9

110.2

47.59

20.0

10

110.9

47.55

19.9

MV

-

47.63

20.0

SD

-

0.05

0.05

MV = mean value

SD = standard deviation
*) of the last 10 measurements

**) Time from transfer of the test solution into the test vessel until end of each measurement

***) Values already corrected acc. to Harkins & Jordan

Validation

The surface tension of the reference item hexane was determined on 2012-07-16 as 18.33 ± 0.02 mN/m (20 °C) for the Ring Nr. 1, RI 21. This value is in the range of tolerance of ± 1 mN/m acc. to the literature value of 18.42 mN/m at 20 °C.

Applicant's summary and conclusion

Conclusions:
The surface tension of a 1 g/L aqueous solution of barium neodecanoate at 20 °C was determined to be 42.98 mN/m (standard deviation of 0.04 mN/m). Due to the fact that the surface tension is < 60 mN/m, the test item is classified as surface-active substance.