Registration Dossier
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EC number: 686-241-8 | CAS number: 81058-27-7
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 19 December 2016 - 07 July 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- 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: isothermal thermogravimetry
- Specific details on test material used for the study:
- - Batch n°: M16FB2273
- Analytical purity: 101.7%
- Expiration date: 12 September 2017
- Storage condition: at room temperature - Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Conclusions:
- The isothermal TGA effusion method was applied for the determination of the vapour pressure of JNJ-42808389-AAA (T003421).
The vapour pressure of the test item was 3.8E-7Pa (or 2.8E-9 mmHg) at 20°C (293K) and 1.1E-6 Pa (or 8.0E-9 mmHg) at 25°C (298K).
Reference
Reference substances
Validation of the method is performed at least once every year (project 517972). Each reference substance was measured in duplicate by TGA using a temperature program that was specific for the substance. Plots of log vT obtained at elevated temperatures and 1/T were inter- or extrapolated to determine the log vTvalues at 20°C (log vT,20). The log vT,20 values were plotted against the logarithm of the vapour pressure at 20°C in Pascal units (log PT,20). Linear regression analysis using the least squares method yielded an equation of log PT,20= 1.26 log vT,20+ 4.98. The coefficient of correlation (r) was > 0.99. The constants c and d specific for the experimental arrangement were 1.26 and 4.98, respectively.
Results
Isothermal TGA analysis: The vapour pressure regression curve using the data from Experiment 1 and 2 had a coefficient of correlation of < 0.99. Therefore a 3rd experiment was performed. Since the coefficient of correlation was > 0.99 for Experiment 1 and Experiment 3, the results from Experiment 2 were excluded.
From the plot of the log PT of the test item as a function of the reciprocal temperature the equation of the curve could be derived: log PT= -7946 x 1/T + 20.68 (r = 0.9993, n = 8). The results for the vapour pressure of the test item at 20°C and 25°C are:
| Temperature (°C) | log PT | PT (Pa) | PT (mm Hg) |
| 20 | -6.42 | 3.8 x 10-7 | 2.8 x 10-9 |
| 25 | -5.97 | 1.1 x 10-6 | 8.0 x 10-9 |
Description of key information
The vapour pressure of T003421 was assessed using the isothermal TGA effusion method, following the guidelines OECD 104, EU method A.4 and EPA OPPTS 830.7950 (K1, Ciric, 2017).
The vapour pressure of the substance was determined to be 3.8E-7 Pa at 20°C and 1.1E-6 Pa at 25°C.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
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