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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
26 November 2015 to 13 December 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted in accordance with international guidelines and in accordance with GLP. All relevant validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
0 Pa
Vapour pressure:
0.002 Pa
Transition / decomposition:
no

Table 1. Measured Vapour pressures and Corresponding Temperatures


 





















































 Temperature (°C) Vapour Pressure (hPa)
 30 1.6E-05
 40 5.9E-05
 50 1.1E-04
 60 1.3E-04
 70 2.3E-04
 75 3.2E-04
 80 5.4E-04
 85 9.1E-04
 90 1.5E-03
 95 2.6E-03
 100 4.2E-03

 


The data points measured at 30 to 70 °C were not included in the linear regression because they showed a typical deviation caused by volatile impurities at the beginning of a measurement.


 


Vapour pressure (logarithmic scale) was plotted as a function of the inverse temperature (1/T, T in Kelvin). The values for 20, 25 and 50 °C were calculated, using the Antoine Constants A, B and C as shown in Table 2.


 


Table 2. Antoine Parameters and Extrapolated Vapour Pressures

























 T / °Cp / hPa  log (p/hPa) = A + B/C+T[°C])
 20 2.3E-07 A = 13.21121
 25 5.0E-07 B = -5817.72
 50 1.6E-05 C = 273.15
Conclusions:
The vapour pressure was determined to be 2.3E-05 Pa (20 °C).
Executive summary:

The vapour pressure of the test item was determined in accordance with EC Method A.4 (Vapour Pressure, Effusion Method) and OECD 104 (Vapour Pressure) using a Knudsen Cell (Dornhagen, 2016). The vapour pressure was determined to be 2.3E-05 Pa (20 °C).

Description of key information

Vapour Pressure = 2.3E-05 Pa (20 °C); OECD 104; Dornhagen (2016)

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
20 °C

Additional information

In a single key study, the vapour pressure of the test item was determined in accordance with EC Method A.4 (Vapour Pressure, Effusion Method) and OECD 104 (Vapour Pressure) using a Knudsen Cell (Dornhagen, 2016). The vapour pressure was determined to be 2.3E-05 Pa (20 °C).