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EC number: 946-364-2 | CAS number: -
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:
- 2015-04-02 - 2015-06-02
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Deviations:
- no
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- The department of health of the government of the United Kingdom
- Type of method:
- ring method
- Key result
- Surface tension:
- 52.6 mN/m
- Temp.:
- 21 °C
- Conc.:
- 90 vol%
- Conclusions:
- The mean surface tension of duplicate nominally 90% saturated solutions has been determined to be 52.6 ± 2.0 mN/m at 21.0 ± 0.5 °C. The test item was considered to be surface active.
- Executive summary:
The surface tension of the test item was determined by using a ring method comparable to EU Method A.5 and OECD Guideline 115 in compliance with GLP. The mean surface tension of duplicate nominally 90% saturated solutions has been determined to be 52.6 ± 2.0 mN/m at 21.0 ± 0.5 °C. The test item was considered to be surface active.
Reference
The readings, times and temperatures for the sample solutions are shown in the following tables:
Table 2: Sample 1
| Time (mins) | Reading (mN/m) | Temperature (°C) |
| 92 | 51.5 | 21.0 |
| 115 | 51.0 | 21.0 |
| 132 | 51.5 | 20.8 |
| 142 | 51.5 | 20.8 |
| 150 | 51.5 | 20.8 |
Table 3: Sample 2
| Time (mins) | Reading (mN/m) | Temperature (°C) |
| 164 | 53.5 | 20.8 |
| 172 | 54.0 | 20.8 |
| 195 | 53.5 | 20.8 |
| 205 | 54.0 | 20.8 |
| 224 | 54.0 | 20.8 |
Mean Sample 1 result : 51.4 mN/m; pH of Sample 1 : 6.65
Mean Sample 2 result : 53.8 mN/m; pH of Sample 2 : 6.75
Mean result: 52.6 ± 2.0 mN/m
Overall temperature : 21.0 ± 0.5 °C
Discussion
The cleaned up solutions, although visually clear and colorless, displayed a Tyndall beam effect indicating that some undissolved test item had not been removed but was consistent with what occurred in the water solubility test. This fine emulsion of test item could not be removed.
With the test item being a complex mixture and the inability to remove all of the excess undissolved material from the solution, this was probably why the two sample results were not in close agreement.
According to criteria mentioned in Method AS, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active.
Description of key information
The mean surface tension of duplicate nominally 90% saturated solutions has been determined to be 52.6 ± 2.0 mN/m at 21.0 ± 0.5 °C. The test item was considered to be surface active.
Key value for chemical safety assessment
- Surface tension:
- 52.6
Additional information
The surface tension of the test item was determined by using a ring method comparable to EU Method A.5 and OECD Guideline 115 (Fox, 2015) in compliance with GLP. The mean surface tension of duplicate nominally 90% saturated solutions has been determined to be
52.6 ± 2.0 mN/m at 21.0 ± 0.5 °C. The test item was considered to be surface active.
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