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EC number: 816-845-0 | CAS number: 1818326-42-9
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:
- From June 06, 2018 to June 29, 2018
- Reliability:
- 1 (reliable without restriction)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- EC No. 761/2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- March 23, 2006
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.006 Pa
- Remarks on result:
- other: The vapour pressure was determined by using the weight loss of the test item (3 determinations) in the temperature range of 210°C to 240°C.
- Conclusions:
- The vapour pressure of the test item was determined as 5.74 x 10-3 Pa at 20 °C, using the isothermal thermogravimetry effusion method.
- Executive summary:
The vapour pressure of the test item was determined using the isothermal thermogravimetry effusion method, according to the A.4 EU method and OECD 104 guideline, and in compliance with the GLP.
The evaporation rates of the test item and the reference substances at elevated temperatures and ambient pressure were calculated from the weight loss measured over period of times. Linear regression analysis "log Vt versus 1/T" allows the determination of the evaporation rate at 20°C for the test item and the reference substances. Based on the relationship between evaporation rates and known vapour pressures for the reference substances, the vapour pressure of the test item can be assessed.
A value of the vapour pressure of the test item was determined using the data obtained between 210 °C and 240 °C. The vapour pressure of the test item was calculated (mean of three determinations) to: 5.74 x 10-3 Pa at 20 °C.
The vapour pressure study is classified as acceptable and satisfies the guideline requirements of the EU method A.4 and OECD 104.
Reference
The results of the isothermal TGA analysis are given in Table 2 (attached document).
Figure 2 (attached document) shows the plot of the log Vt (evaporation rate) of the test item as function of the reciprocal temperatures. The coefficient of correlation (R2) was 0.9592.
The regression line of log Pt as a function of log Vt used for calibration is given in Figure 3 (attached document). The coefficient of correlation (R2) was 0.9825. The resulting equation was :
log Pt = 4.3781 + 1.0022 * log Vt
Inserting the equation for log VT above, the following equation for the temperature dependence of the vapour pressure of the test item is obtained:
log Pt = C + D (a * 1000/T + b) = C + (D * b) + (D * a * 1000)/T
(where a=-2.4518; b=1.7634; C=4.3781 and D=1.0022)
With this equation, a following vapour pressure results were obtained : 5.74 x 10-3 Pa at 20 °C.
Description of key information
The vapour pressure of the test item was determined as 5.74 x 10-3 Pa at 20 °C, using the isothermal thermogravimetry effusion method.
Key value for chemical safety assessment
- Vapour pressure:
- 0.006 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of the test item was determined using the isothermal thermogravimetry effusion method, according to the A.4 EU method and OECD 104 guideline, and in compliance with the GLP.
The evaporation rates of the test item and the reference substances at elevated temperatures and ambient pressure were calculated from the weight loss measured over period of times. Linear regression analysis "log Vt versus 1/T" allows the determination of the evaporation rate at 20°C for the test item and the reference substances. Based on the relationship between evaporation rates and known vapour pressures for the reference substances, the vapour pressure of the test item can be assessed.
A value of the vapour pressure of the test item was determined using the data obtained between 210 °C and 240 °C. The vapour pressure of the test item was calculated (mean of three determinations) to: 5.74 x 10-3 Pa at 20 °C.
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