Registration Dossier

Physical & Chemical properties

Surface tension

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
surface tension
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
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:
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
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 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.
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:
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
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.
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:
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
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.

Description of key information

Magnesium 2-ethylhexanoate represents an inorganic salt containing an anion of an acid with a carbon chain length of 6, it can safely be assumed that this substance is surface active.

Key value for chemical safety assessment

Additional information

Three tests on the surface tension according to OECD TG 115 were recently conducted for a representative sub-set of MCRC substances, i.e. barium neodecanoate (carbon chain length: 10), potassium 2-ethylhexanoate (carbon chain length: 6) and fatty acids, C16-18, barium salts (carbon chain length: 16-18), yielding a result as surface-active substance for barium neodecanoate (42.98 mN/m) and potassium 2-ethylhexanoate (47.63 mN/m) and not surface-active substance for fatty acids, C16-18, barium salts (63.62 mN/m). Since magnesium 2-ethylhexanoate represents an inorganic salt containing an anion of an acid with a carbon chain length of 6, it can safely be assumed that this substance is surface active. As stated in the ECHA Guidance on information requirements and chemical safety assessment, Chapter R.7a: Endpoint specific guidance, R.7.1.18.1, May 2008, p.182, 185, a low surface tension (of below 33 mN/m) is one indicator for aspiration hazard. It can safely be assumed that the surface tension effect of magnesium 2-ethylhexanoate is above 33 mN/m, thus further testing is not required (in accordance with Regulation (EC) 1907/2006, Annex VII, section 7.6, Column 2).