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EC number: 205-251-1 | CAS number: 136-53-8
Surface tension
Administrative data
Link to relevant study record(s)
- 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
- 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.
- 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
- 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
- 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
- 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
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
Referenceopen allclose all
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.
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.
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.
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).
Key value for chemical safety assessment
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