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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Principles of method if other than guideline:
Data from assessment report, no method provided
GLP compliance:
no
Type of method:
effusion method: isothermal thermogravimetry
Test no.:
#1
Temp.:
30.3 °C
Vapour pressure:
0 Torr
Test no.:
#2
Temp.:
42.8 °C
Vapour pressure:
0 Torr
Test no.:
#3
Temp.:
56.6 °C
Vapour pressure:
0 Torr
Test no.:
#4
Temp.:
57.4 °C
Vapour pressure:
0 Torr
Test no.:
#5
Temp.:
57.9 °C
Vapour pressure:
0 Torr
Test no.:
#6
Temp.:
65.6 °C
Vapour pressure:
0 Torr
Test no.:
#7
Temp.:
68.2 °C
Vapour pressure:
0 Torr
Test no.:
#8
Temp.:
72.5 °C
Vapour pressure:
0 Torr
Test no.:
#9
Temp.:
76.3 °C
Vapour pressure:
0 Torr
Test no.:
#10
Temp.:
83.8 °C
Vapour pressure:
0 Torr
Temp.:
85.5 °C
Vapour pressure:
0 Torr
Temp.:
87 °C
Vapour pressure:
0 Torr
Temp.:
105.9 °C
Vapour pressure:
0.003 Torr

If plotted graphically, the above values of Wiedemann (1972) follow the equation: logp= 13.3052 -A/T, where A= 5988.39 +/- 275.51 (p=pressure in torr, T=temperature in °K)

For a temperature of 20°C (293.15 K) a vapor pressure of 0.000010 Pa was calculated.

For a temperature of 50°C (323.15 K) a vapor pressure of 0.00079 Pa was calculated.

Conclusions:
20°C: 0.000010 Pa
50°C: 0.00079 Pa
Executive summary:

Weidmann (1972, cited in US-EPA document EPA-504 -1 -75 -028 ;1975, page 18 and 19) reported vapor pressure data for monuron in the temperature range of 30.3 to 105.9 °C.

If plotted graphically, the above values of Wiedemann (1972) follow the equation: logp= 13.3052 -A/T, where A= 5988.39 +/- 275.51 (p=pressure in torr, T=temperature in °K) as reported in the US-EPA document EPA-504 -1 -75 -028 ;1975, page 19. That equation was used to calculte the vapor pressure at 20 and 50°C.

For a temperature of 20°C (293.15 K) a vapor pressure of 0.000010 Pa was calculated.

For a temperature of 50°C (323.15 K) a vapor pressure of 0.00079 Pa was calculated.

Since this information is obtained form a peer reviewed document from an international accepted authority the result is considered reliable with restrictions for the further assessment.

Description of key information

Vapor pressure 20°C: 0.00001 Pa

Vapor pressure 50°C: 0.00079 Pa

Key value for chemical safety assessment

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

Additional information