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EC number: 268-640-5 | CAS number: 68132-47-8
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:
- 14 June 2016 to 17 July 2016
- 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)
- Type of method:
- ring method
- Key result
- Surface tension:
- 28.5 mN/m
- Temp.:
- 21.5 °C
- Conc.:
- 1 g/L
- Remarks on result:
- other: sample solutions prepared at nominal concentration of 1.1 g/L and diluted to 90 % saturation
- Conclusions:
- Surface tension was determined to be 28.5 ± 0.5 mN/m at 21.5 ± 0.5 °C for solutions prepared nominally at 1.1 g/L test item in water and diluted to 90 % saturation. The test material was considered to be surface active.
- Executive summary:
GUIDELINE
The determination was carried out using a ring method designed to be compatible with OECD 115 (27 July 1995) and Method A.5 Surface Tension of Commission Regulation (EC) No 440/2008 (30 May 2008).
RESULTS
Surface tension was determined to be 28.5 ± 0.5 mN/m at 21.5 ± 0.5 °C for solutions prepared nominally at 1.1 g/L test item in water and diluted to 90 % saturation. The test material was considered to be surface active.
- Endpoint:
- surface tension
- Remarks:
- critical micelle concentration
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 14 June 2017 to 17 July 2016
- 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)
- Type of method:
- ring method
- Key result
- Surface tension:
- >= 0.007 - <= 0.032 other: g/L
- Temp.:
- 21 °C
- Remarks on result:
- other: critical micelle concentration
- Conclusions:
- The critical micelle concentration of the test item was determined to be in the approximate range of 7 x 10E-03 g/L to 3.2 x 10E-2 g/L at 21 ± 2 °C.
- Executive summary:
GUIDELINE
The determination was carried out using a ring method designed to be compatible with OECD 115 (27 July 1995) and Method A.5 Surface Tension of Commission Regulation (EC) No 440/2008 (30 May 2008).
RESULTS
The critical micelle concentration of the test item was determined to be in the approximate range of 7 x 10E-03 g/L to 3.2 x 10E-2 g/L at 21 ± 2 °C.
Referenceopen allclose all
RESULTS
- The readings, times and temperatures for the sample solutions are shown below in Table 10 for sample 1 and Table 11 for sample 2.
- Mean sample 1 result: 28.6 mN/m (pH of sample 1 = 9.3)
- Mean sample 2 result: 28.5 mN/m (pH of sample 2 = 9.3)
- Overall result: 28.5 ± 0.5 mN/m
- Overall temperature: 21.5 ± 0.5 °C
Table 10 – Sample 1
Time (mins) |
Reading (mN/m) |
Temperature (°C) |
78 |
29.0 |
21.4 |
89 |
28.5 |
21.6 |
99 |
28.5 |
21.6 |
110 |
28.5 |
21.6 |
120 |
28.5 |
21.6 |
Table 11 – Sample 2
Time (mins) |
Reading (mN/m) |
Temperature (°C) |
198 |
28.5 |
21.4 |
208 |
28.5 |
21.4 |
218 |
28.5 |
21.4 |
228 |
28.5 |
21.4 |
239 |
28.5 |
21.4 |
RESULTS
- Readings and temperatures for the sample solutions are shown in Table 19 (below).
- Concentrations (g/L), Log10 [concentration (g/L)] and mean surface tension values for the sample solutions are shown in Table 20 (below).
- The plot of surface tension (mN/m) versus Log10 [concentration (g/L)] is shown in Figures 6 and 7 (attached). The plot was produced twice to demonstrate the range of possible outcomes. Line 1 (red) was generated from linear regression of four sample solution concentrations for which the surface tension was shown to be concentration dependent. Line 2 (green) was generated from linear regression of three or five sample concentrations for which the surface tension was observed to be essentially independent of concentration.
- The intersection of the two lines gave the critical micelle concentration and was calculated by solving two equations.
- Referring to Figure 6 (attached), the critical micelle concentration (CMC) was determined to be 3.2 x 10E-02 g/L. Samples at 0.10 and 0.03 g/L were not used in generating the two lines. Equations used were y = -19.9x + 1.11 for line 1 (red) and y = -2.09x + 27.8 for line 2 (green).
- Referring to Figure 7 (attached), the critical micelle concentration was determined to be 7 x 10E-03 g/L. Equations used were y = -19.9x + 1.11 for line 1 (red) and y=-8.04x +26.4 for line 2 (green).
Table 19 – Sample readings and temperatures
Sample concentration (g/L) |
Reading (mN/m) |
Temperature (°C) |
1.00 |
27.5 |
20.6 |
1.00 |
27.5 |
20.6 |
1.00 |
27.5 |
20.4 |
0.50 |
29.0 |
20.0 |
0.50 |
29.0 |
20.0 |
0.50 |
29.0 |
20.0 |
0.30 |
28.5 |
20.4 |
0.30 |
28.5 |
20.4 |
0.30 |
28.5 |
20.4 |
0.10 |
35.0 |
20.6 |
0.10 |
35.0 |
20.6 |
0.10 |
35.0 |
20.8 |
0.03 |
39.0 |
22.0 |
0.03 |
39.0 |
21.8 |
0.03 |
39.0 |
21.8 |
0.01 |
40.5 |
20.8 |
0.01 |
40.5 |
20.8 |
0.01 |
40.5 |
20.8 |
0.003 |
52.0 |
21.6 |
0.003 |
52.0 |
21.4 |
0.003 |
52.0 |
21.0 |
0.001 |
61.0 |
20.8 |
0.001 |
61.0 |
20.6 |
0.001 |
61.0 |
20.6 |
0.0003 |
71.0 |
20.0 |
0.0003 |
71.0 |
20.0 |
0.0003 |
71.0 |
19.8 |
Table 20 – Concentration, Log10 concentration and mean surface tension of sample solutions
Concentration (g/L) |
Log10 concentration (g/L) |
Mean surface tension (mN/m) |
Solution pH |
1.00 |
0.00 |
27.5 |
8.7 |
0.50 |
-0.30 |
29.0 |
8.7 |
0.30 |
-0.52 |
28.5 |
8.2 |
0.10 |
-1.00 |
35.0 |
7.3 |
0.03 |
-1.52 |
39.0 |
7.0 |
0.01 |
-2.00 |
40.5 |
6.4 |
0.003 |
-2.52 |
52.0 |
5.8 |
0.001 |
-3.00 |
61.0 |
6.0 |
0.0003 |
-3.52 |
71.0 |
4.5 |
Description of key information
Key value for chemical safety assessment
Additional information
The surface tension and critical micelle concentration determinations were carried out using a ring method designed to be compatible with OECD 115 (27 July 1995) and Method A.5 Surface Tension of Commission Regulation (EC) No 440/2008 (30 May 2008).
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