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EC number: 271-668-0 | CAS number: 68603-62-3
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:
- 26 June 2017 - 06 November 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Version / remarks:
- Regulation (EC) 440/2008 of 30 May 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Version / remarks:
- 27 July 1995
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- OECD harmonised ring method
- Key result
- Surface tension:
- 33.9 mN/m
- Temp.:
- 20.4 °C
- Remarks on result:
- other: Mean Value
- Remarks:
- Value determined using the result of measurement 1 and measurement 2.
- Surface tension:
- 34 mN/m
- Temp.:
- 20.5 °C
- Remarks on result:
- other: Measurement 1
- Surface tension:
- 32.7 mN/m
- Temp.:
- 20.2 °C
- Remarks on result:
- other: Measurement 2
- Conclusions:
- The mean of two determinations of the surface tension of a 90 % saturated solution of the test item in water was determined to be 33.9 mN/m at 20.4 °C.
- Executive summary:
EU Method A.5. – The surface tension of the test item was determined using the OECD harmonised ring test method. The procedure employed was designed to be compatible with Method A.5. Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008.
Two determinations were carried out, using a calibrated instrument for which a calibration factor had been determined. Duplicate samples were shaken for about 40 hours to prepare a saturated solution. Afterwards they were diluted to obtain a 90 % saturated solution. Immediately after dilution the solution was introduced into the appliance and equilibrated to reach a temperature of 20 °C ± 0.5 °C. The surface tension of each solution was measured repeatedly until the standard deviation of the last five determinations was equal or lower than 0.1 mN/m.
The mean surface tension following two measurements of a 90 % saturated solution of test item was determined to be 33.9 mN/m at 20.4 °C.
Reference
Table 5: Measured Surface Tension of Test Item (Test One)
Measurement Number |
Temperature |
Measured Surface Tension |
|||
℃ |
mN/m |
||||
1 |
20.6 |
34.2 |
|||
2 |
20.4 |
34.1 |
|||
3 |
20.6 |
34.0 |
|||
4 |
20.5 |
34.0 |
|||
5 |
20.5 |
33.9 |
|||
Mean |
20.5 |
34.0 |
|||
Standard Deviation |
- |
0.1 |
Table 6: Measured Surface Tension of Test Item (Test Two)
Measurement Number |
Temperature |
Measured Surface Tension |
℃ |
mN/m |
|
1 |
20.2 |
32.7 |
2 |
20.2 |
32.7 |
3 |
20.2 |
32.7 |
4 |
20.1 |
32.8 |
5 |
20.2 |
32.8 |
Mean |
20.2 |
32.7 |
Standard Deviation |
- |
0.1 |
Table 7: Corrected Surface Tension of Test Item
Measurement Number |
Weighed amount per 100 mL |
Mean temperature |
Mean Surface Tension |
Φb-corrected Mean Surface Tension |
mg |
℃ |
mN/m |
mN/m |
|
1 |
109.9 |
20.5 |
34.0 |
34.5 |
2 |
106.9 |
20.2 |
32.7 |
33.2 |
Mean: |
108.3 |
20.4 |
33.4 |
33.9 |
Absolute Deviation |
3.3 |
0.3 |
1.3 |
1.3 |
Description of key information
Surface Tension: 33.9 mN/m at 20 °C; EU Method A.5.; C Bär (2017)
Key value for chemical safety assessment
- Surface tension:
- 33.9
Additional information
EU Method A.5. – The surface tension of the test item was determined using the OECD harmonised ring test method. The procedure employed was designed to be compatible with Method A.5. Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008.
Two determinations were carried out, using a calibrated instrument for which a calibration factor had been determined. Duplicate samples were shaken for about 40 hours to prepare a saturated solution. Afterwards they were diluted to obtain a 90 % saturated solution. Immediately after dilution the solution was introduced into the appliance and equilibrated to reach a temperature of 20 °C ± 0.5 °C. The surface tension of each solution was measured repeatedly until the standard deviation of the last five determinations was equal or lower than 0.1 mN/m.
The mean surface tension following two measurements of a 90 % saturated solution of test item was determined to be 33.9 mN/m at 20.4 °C.
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