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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:
1990-07-06
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
no
Type of method:
dynamic method
Key result
Temp.:
20 °C
Vapour pressure:
36.37 hPa
Remarks on result:
other: calculated from the regression equation
Temp.:
25 °C
Vapour pressure:
47.06 hPa
Remarks on result:
other: calculated from the regression equation
Temp.:
50 °C
Vapour pressure:
149.69 hPa
Remarks on result:
other: calculated from the regression equation

Results:

 Temperature [°C]

 Vapour Pressure [hPa]

(measurement)

 Vapour Pressure [hPa]

(calculation)

  Aberration [%
 26.28 50.00  50.19  -0.38 
 33.08 70.00  69.98  0.03 
 40.76 100.0  99.93  0.07 
 57.10 200.0  200.8  -0,39 
 67.12 300.0  297.0 0.99
 81.45 500.0  498.8  0.24 
 91.71 700.0 703.6  -0.51 
 103.64 1045  1023  2.13 
 130.01 2099  2151  -2.43 
 143.17 2942  3001  -1.98 
 153.65 3855  3852  0.08 
 164.32 5012  4901  2.26 
 181.00 6938  6971  -0.48 
 199.20 9964  9935  0.29 
 103.32 -  1013.25  - 

The regression of the results leads with a mean deviation of 0.88 % to the following equation:

ln(p/hPa) = 10.5800 - 3676.50 / (244.61 + t/°C)

The vapour pressure at 20 °C, 25 °C and 50°C was calculated from the regression equation.

The normal boiling temperature was obtained by intrapolation from the vapour pressure curve.

Conclusions:
The vapour pressure of the test item was determined to be 36.37 hPa at 20 °C.
Executive summary:

A study similar to OECD TG 104 was performed to determine the vapour pressure of the test item using the dynamic method. The vapour pressure was determined to be 36.37 hPa at 20 °C, 47.06 hPa at 25 °C and 149.69 hPa at 50 °C, respectively.

Description of key information

The vapour pressure of the test item was determined to be 36.37 hPa at 20 °C.

Key value for chemical safety assessment

Vapour pressure:
36.37 hPa
at the temperature of:
20 °C

Additional information

A study similar to OECD TG 104 was performed to determine the vapour pressure of the test item using the dynamic method. The vapour pressure was determined to be 36.37 hPa at 20 °C, 47.06 hPa at 25 °C and 149.69 hPa at 50 °C, respectively (reference 4.6-1).