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EC number: 236-152-1 | CAS number: 13194-48-4
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- from 2000-08-02 to 2000-08-15
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 001
- Report date:
- 2001
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
Test material
- Reference substance name:
- Ethoprophos
- EC Number:
- 236-152-1
- EC Name:
- Ethoprophos
- Cas Number:
- 13194-48-4
- Molecular formula:
- C8H19O2PS2
- IUPAC Name:
- ethyl bis(propylsulfanyl)phosphinate
- Test material form:
- liquid
Constituent 1
Results and discussion
Vapour pressureopen allclose all
- Key result
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0.123 Pa
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.078 Pa
Any other information on results incl. tables
Various test parameters and measurements, together with the statistical analyses are presented in Tables 1 and 2 for the two tests. The resultant vapour pressure-temperature plots with the statistics of these regression plots detailed in Tables 1 and 2.
Table 1
Vapour Pressure Results - Test 1
Process parameters
Orifice diameter (µm): | 522.4 |
Orifice length (µm): | 95 |
Orifice area (µm2): | 2.13E+05 |
Molecular Weight (g): | 242.3 |
Clausing factor: | 0.87998 |
Vapour pressure calculations
Date | Time | Cell + sample weight | Mass loss (kg) | Temp (°C) | Time Diff (s) | Vapour pressure (Pa) | 1/T (K) | Ln Vapour pressure |
15/08/2000 | 8:56 | 55.455 | 6.93E-07 | 31.4 | 4500 | 2.11E-01 | 0.00328 | -1.56 |
15/08/2000 | 10:11 | 54.762 | ||||||
15/08/2000 | 10:45 | 54.507 | 3.51 E-07 | 24.2 | 4020 | 1.18E-01 | 0.00336 | -2.14 |
15/08/2000 | 11:52 | 54.156 | ||||||
15/08/2000 | 12:27 | 54.021 | 2.24E-07 | 20.4 | 3900 | 7.73E-02 | 0.00341 | -2.56 |
15/08/2000 | 13:32 | 53.797 | ||||||
15/08/2000 | 14.22 | 53.652 | 1.54E-07 | 16.0 | 3960 | 5.19E-02 | 0.00346 | -2.96 |
15/08/2000 | 158:28 | 53.498 |
1/TvsLnVP statistic
Slope: | -8.10E+03 |
Intercept: | 2.51E+01 |
Correlation: | -9.99E-01 |
VP at 25 °C (Pa): | 1.21E-01 |
VP at 20 °C (Pa): | 7.63E-02 |
Table 2
Vapour Pressure Results - Test 2
Process parameters
Orifice diameter (µm): | 552.8 |
Orifice length (µm): | 95 |
Orifice area (µm2): | 2.13E+05 |
Molecular Weight (g): | 242-3 |
Clausing factor: | 0.88006 |
Vapour pressure calculations
Date | Time | Cell + sample weight | Mass loss (kg) | Temp (°C) | Time Diff (s) | Vapour pressure (Pa) | 1/T (K) | Ln Vapour pressure |
15/08/2000 | 08:56 | 58.147 | 721E-07 | 31.4 | 4500 | 2.19E-01 | 0.00328 | -1.52 |
15/08/2000 | 10.11 | 57.426 | ||||||
15/08/2000 | 10:45 | 57.167 | 3.55E-07 | 24.2 | 4020 | 1.19E-01 | 0.00336 | -2.13 |
15/08/2000 | 11.52 | 56.812 | ||||||
15/08/2000 | 12:27 | 56.674 | 2.65E-07 | 20.4 | 3900 | 7.77E-02 | 0.00341 | -2.55 |
15/08/2000 | 14:22 | 56.448 | ||||||
15/08/2000 | 15:28 | 56.301 | 1.67E-07 | 16.0 | 3960 | 5.61 E-02 | 0.00346 | -2.88 |
15/08/2000 | 15:28 | 56.134 |
1/TvsLnVP statistic
Slope: | -7.93E+03 |
Intercept: | 2.45E+01 |
Correlation: | -9.98E-01 |
VP at 25 °C (Pa): | 1.25E-01 |
VP at 20 °C (Pa): | 7.93E-02 |
DISCUSSION
The plotted vapour pressure-temperature relationships both exhibited good linearity and the results from the two tests are largely coincident. Results were calculated from the relationships and the mean values from both tests were found to be 0.0778 Pa at 20 °C and 0.123 Pa at 25 °C. These results are considered to be representative of the compound.
Applicant's summary and conclusion
- Conclusions:
- The mean vapour pressures of purified test substances were determined by the Knudsen Effusion method to be 7.8 x 10^-2 Pa at 20 °C and 12.3 x 10^-2 Pa at 25 °C.
- Executive summary:
This study was performed to provide data for the vapour pressure of purified Test substances in accordance with EC Directive 92/69 Method A4, OECD Guideline 104 (1995) and OPPTS 830.7950. The test was performed using the Knudsen effusion method and the mean vapour pressures of duplicate tests were found to be:
7.8 * 10-2 Pa at 20 °C
12.3 * 10-2 Pa at 25 °C
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