Zinc dibenzoate

Surface tension

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 guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2010-10-20

Type of method:

OECD harmonised ring method

Test material

Test material information

Constituent 1

Reference substance name:

Potassium 2-ethylhexanoate

EC Number:

221-625-7

EC Name:

Potassium 2-ethylhexanoate

Cas Number:

3164-85-0

Molecular formula:

C8H15O2.K

IUPAC Name:

potassium 2-ethylhexanoate

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.