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EC number: 227-376-0 | CAS number: 5810-88-8
Surface tension
Administrative data
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 13 Dec - 27 Dec 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
- Type of method:
- ring method
Test material
- Reference substance name:
- O,O-bis(2-ethylhexyl) hydrogen dithiophosphate
- EC Number:
- 227-376-0
- EC Name:
- O,O-bis(2-ethylhexyl) hydrogen dithiophosphate
- Cas Number:
- 5810-88-8
- Molecular formula:
- C16H35O2PS2
- IUPAC Name:
- O,O-bis(2-ethylhexyl) sulfanylphosphonothioate
Constituent 1
- Specific details on test material used for the study:
- Storage conditions: Ambient temperature (10 to 30 °C), protected from light
Results and discussion
Surface tension
- Surface tension:
- 53.8 mN/m
- Temp.:
- 20 °C
- Conc.:
- 90 vol%
Any other information on results incl. tables
Results
Table 1 – Surface Tension Results
Measurement |
1 |
2 |
3 |
4 |
5 |
6 |
Time [s] |
1215 |
1335 |
1455 |
1576 |
1696 |
1816 |
s[mN/m] uncorrected |
59.23 |
59.17 |
59.12 |
59.04 |
59.00 |
58.94 |
s[mN/m] corrected according to Zuidema and Waters[1] |
53.89 |
53.84 |
53.78 |
53.71 |
53.67 |
53.61 |
The measurement showed a decreasing tendency even after adapting to 20 °C for 30 minutes and more than 20 minutes measuring time (total more than 50 minutes). According to the study monitor the behavior of the test item within a determination of the water solubility indicated self-organization e.g. into micelles. The observed tendency of the measurement therefore could have been caused by a self-organization of the test item over the measurement time.
Due to the fact that the surface tension showed a time-dependence only a mean value for the measured values could be reported. The mean value of the measurement was 53.8 mN/m. However, due to the observed tendency and the suspected self-organization of the test item it cannot be excluded that this value would decrease further over time.
Conclusion: The surface tension of the aqueous solution was lower than 60 mN/m, the test item had surface-active properties.
[1]Zuidema, H., Waters, C.W.,Ind. Eng.Chem. Analyt.13 (1941), S. 312
Applicant's summary and conclusion
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