Zinc bis(2-ethylhexanoate)

Surface tension

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2013-05-21 to 2013-06-05

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:

yes (incl. QA statement)

Remarks:

signed 2010-10-20

Type of method:

OECD harmonised ring method

Specific details on test material used for the study:

- Storage condition of test material: Store at ambient temperatures and at dry conditions.

Surface tension:

63.62 mN/m

Temp.:

20 °C

Conc.:

90 other: % saturated aqueous solution of Fatty acids, C16-18, barium salts

Remarks on result:

other: standard deviation of 0.04 mN/m

Determination of the density

The density of the 90 % saturated aqueous solution of Fatty acids,C16-18, barium salts in double-distilled water was determined in a preliminary measurement to be 1.017 g/cm³ (20.0 °C).

Temperature

The temperature range of the test solution during the whole measurements was 19.9 - 20.1 °C

The room temperature during these measurements was 20.3 - 21.0 °C

Time line of the study

After transfer of the test solution into the test vessel 53.0 minutes were needed to reach equilibrium at which 10 successive measurements with a standard deviation of 0.04 mN/m were possible

Surface tension of a 90 % saturated aqueous solution of Fatty acids,C16-18, barium salts

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	46.3	63.68	20.0
2	47.0	63.66	20.0
3	47.8	63.65	20.0
4	48.5	63.64	20.0
5	49.3	63.61	20.0
6	50.0	63.60	20.0
7	50.8	63.65	20.0
8	51.5	63.55	20.0
9	52.2	63.57	19.9
10	53.0	63.56	20.0
MV	-	63.62	20.0
SD	-	0.04	0.03

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.

Conclusions:

The surface tension of a 90 % saturated aqueous solution of Fatty acids, C16-18, barium salts at 20 °C was determined to be 63.62 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 not surface-active substance.

Reference 2

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2013-05-21 to 2013-05-22

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:

yes (incl. QA statement)

Remarks:

signed 2010-10-20

Type of method:

OECD harmonised ring method

Surface tension:

42.98 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Remarks on result:

other: standard deviation of 0.04 mN/m

Determination of the density

The density of the1 g/L aqueous solution of barium neodecanoate in double distilled water was determined in a preliminary measurement to be 1.002 g/cm³ (20.0 °C).

Temperature

The temperature range of the test solution during the whole measurements was 19.9 - 20.0 °C

The room temperature during these measurements was 19.7 - 20.5 °C

Time line of the study

After transfer of the test solution into the test vessel 60.2 minutes were needed to reach equilibrium at which 10 successive measurements with a standard deviation of 0.04 mN/m were possible

Surface tension of a 1 g/L aqueous solution of barium neodecanoate

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	54.0	43.05	20.0
2	54.7	43.03	20.0
3	55.3	43.04	20.0
4	56.0	43.00	20.0
5	56.7	42.97	20.0
6	57.4	42.98	20.0
7	58.1	42.97	20.0
8	58.8	42.94	20.0
9	59.5	42.93	20.0
10	60.2	42.93	20.0
MV	-	42.98	20.0
SD	-	0.04	0

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.

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.

Reference 3

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

2013-05-21 to 2013-05-22

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:

yes (incl. QA statement)

Remarks:

signed 2010-10-20

Type of method:

OECD harmonised ring method

Specific details on test material used for the study:

- Storage condition of test material: Sealed from atmosphere at room temperature

Surface tension:

47.63 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Remarks on result:

other: standard deviation of 0.05 mN/m

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.

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.

Reference 4

Endpoint:

surface tension

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Description of key information

Three tests on the surface tension according to OECD TG 115 were recently conducted for a representative sub-set of metal carboxylates substances, i.e. potassium 2-ethylhexanoate (carbon chain length: 8), barium neodecanoate (carbon chain length: 10) and fatty acids,C16-18, barium salts (carbon chain length: 16 and 18), yielding a result as surface-active substance for potassium 2-ethylhexanoate (47.63 mN/m) and barium neodecanoate (42.98 mN/m) and not surface-active substance for fatty acids, C16-18, barium salts (63.62 mN/m).  Since zinc bis(2-ethylhexanoate) represents an inorganic salt containing an anion of an acid with a carbon chain length of 8, it can safely be assumed that this substance is surface active. Thus further testing is not required (in accordance with regulation (EC) 1907/2006, Annex VII, section 7.6, Column 2).