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EC number: 939-616-8 | CAS number: 68391-03-7
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 12 Feb 2019 From 24 April, 2008 to 25 April, 2008
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- GLP compliance:
- no
- Type of method:
- plate method
- Key result
- Surface tension:
- 23.74 mN/m
- Temp.:
- 25.09 °C
- Conc.:
- 1.05 g/L
- Conclusions:
- Under the study conditions, the surface tension of the test substance at a concentration of 1.05 g/L was determined to be 23.74 mN/m at 25.09°C.
- Executive summary:
As part of the CMC study, the surface tension of the test substance, C12-18 TMAC (96.8% active) was measured according to OECD Guideline 115. Under the study conditions, the surface tension of the test substance at CMC (1.05 g/L) was determined to be 23.74 mN/m at 25.09°C (Oosterwijk, 2020).
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 12 Feb 2019 From 24 April, 2008 to 25 April, 2008
- 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)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- other:
- Version / remarks:
- Vargaftik N.B, Volkow, BN, and Voljak, L.D., International tables of the surface tension of water, J .Phys.Chem.Ref. Data, 12, 817 (1983)
- Principles of method if other than guideline:
- The method is based on the measurement of the force which it is necessary to exert vertically on plate, with an edge in contact with the surface, in order to draw up the film that has formed. Surface tension of water may be influenced by substances which form micelles, such as tensides (= surfactants), or alcohols.
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- plate method
- Key result
- Surface tension:
- 24.6 mN/m
- Temp.:
- 19.8 °C
- Conc.:
- 1 g/L
- Conclusions:
- Under the study conditions, the surface tension of the test substance at a concentration of 1 g/L was determined to be 24.60 ± 0.89 mN/m at 19.8°C.
- Executive summary:
A study was conducted to determine the surface tension of the test substance, C12-14 TMAC (97% active) according to OECD Guideline 115 and EU Method A.5, in compliance with GLP. Under the study conditions, the surface tension of the test substance was determined to be 24.60 ± 0.89 mN/m at 19.8°C. (Muckle, 2019).
Referenceopen allclose all
Findings ReferenceTest:
Table 1: Measured Values NegativeControl
Measurement |
Time |
Mass |
Surface Tension |
Temperature |
No |
s |
g |
mN/m |
°C |
1 |
4.1 |
0.2998 |
73.14 |
18.1 |
2 |
5.1 |
0.2989 |
72.92 |
18.1 |
3 |
6.1 |
0.2988 |
72.89 |
18.1 |
4 |
7.1 |
0.2994 |
73.04 |
18.1 |
5 |
8.1 |
0.2977 |
72.62 |
18.1 |
6 |
9.1 |
0.2990 |
72.94 |
18.1 |
7 |
10.1 |
0.2987 |
72.87 |
18.1 |
8 |
11.1 |
0.2989 |
72.92 |
18.1 |
9 |
12.1 |
0.2989 |
72.92 |
18.1 |
10 |
13.1 |
0.2988 |
72.89 |
18.1 |
Mean |
72.91 |
|
||
Standard Deviation |
0.13 |
|
||
Findings Main Test:
The test substance solution was held at constant temperature (20.0 ± 0.2 °C). 60 min after conclusion of the first measurement series, a second measurement series was performed for verification purposes.
The following values were recorded:
Table 2: Measured Values Test Item First Series
Measurement |
Time |
Mass |
Surface Tension |
Temperature |
No |
s |
g |
mN/m |
°C |
1 |
4.2 |
0.1102 |
26.88 |
19.8 |
2 |
5.1 |
0.1031 |
25.15 |
19.8 |
3 |
6.1 |
0.1014 |
24.74 |
19.8 |
4 |
7.1 |
0.1005 |
24.52 |
19.8 |
5 |
8.1 |
0.0999 |
24.37 |
19.8 |
6 |
9.1 |
0.0992 |
24.20 |
19.8 |
7 |
10.1 |
0.0990 |
24.15 |
19.8 |
8 |
11.1 |
0.0986 |
24.05 |
19.8 |
9 |
12.1 |
0.0984 |
24.00 |
19.8 |
10 |
13.1 |
0.0981 |
23.93 |
19.8 |
Mean |
24.60 |
|
||
Standard Deviation |
0.89 |
|
||
Table 3: Measured Values Test Item Second Series
Measurement |
Time |
Mass |
Surface Tension |
Temperature |
No |
s |
g |
mN/m |
°C |
1 |
4.1 |
0.1156 |
28.20 |
20.0 |
2 |
5.1 |
0.1069 |
26.08 |
20.0 |
3 |
6.1 |
0.1045 |
25.49 |
20.0 |
4 |
7.1 |
0.1034 |
25.22 |
20.0 |
5 |
8.1 |
0.1024 |
24.98 |
20.0 |
6 |
9.1 |
0.1011 |
24.66 |
20.0 |
7 |
10.0 |
0.1007 |
24.57 |
20.0 |
8 |
11.1 |
0.1003 |
24.47 |
20.0 |
9 |
12.0 |
0.1000 |
24.39 |
20.0 |
10 |
13.1 |
0.0997 |
24.32 |
20.0 |
Mean |
25.24 |
|
||
Standard Deviation |
1.18 |
|
||
Result Test substance:
During the specified period of time, no significant changes in the surface tension were detected. Values ranging from 23.93 mN/m to 28.20 mN/m were recorded showing no significant variations. The values of the single determinations show no significant difference (less than 5 % (2.60%) between mean values of the two measurement series).
VALIDITY
The constants result from the graph of the equation of function in temperature dependence of the surface tension of water. The calculated value for the surface tension of H2O at 18.1°C is: 73.02 mN/m The surface tension of the negative control was determined with 72.91 mN/m at 18.1°C, therefore showing a difference of 0.15 % from the calculated value. The difference lies within the accepted range of 1% deviation from the calculated value.
DISCUSSION AND RESULT
The values of the single determinations show no significant difference (2.60% between mean values of the two measurement series). All measured values lay clearly below the threshold for surface tension which is stated in the guidelines. The surface tension of the negative control was determined with a difference of 0.15 % from the stated literature value. Therefore, the result of the test is considered valid and the test substance is classified as “surface active” in a concentration of 1.00 g/L.
Description of key information
The surface tension of the test substance was determined according to OECD Guideline 115 (Oosterwijk, 2020)
Key value for chemical safety assessment
- Surface tension:
- 23.74
- in mN/m at 20°C and concentration in mg/L:
- 1 050
Additional information
The surface tension value of another test sample containing majorly C12 -14 chains was determined to be 24.60 ± 0.89 mN/m for a 1 g/L solution at 19.8°C. The surface tension value of the more representative test sample has been considered as the key value.
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