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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:
25th-26th May 1994
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Commission Directive 92/69/EEC
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other:
Remarks:
Calculated from plot of Log (vapour pressure) vs Reciprocal temperature
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other:
Remarks:
Calculated from plot of Log (vapour pressure) vs Reciprocal temperature
Key result
Test no.:
#3
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other:
Remarks:
Calculated from plot of Log (vapour pressure) vs Reciprocal temperature

For Run 1 during pumpdown, there was some initial degassing of the sample. Run 2 was performed after overnight pumping and recooling. Run 3 was performed after a further overnight pumping and recooling.

Run 1

Temperature (K)

Reciprocal Temperature (1/K)

Mass Difference (Kg)

Vapour Pressure (Pa)

Log Vp

2.9425E+02

3.3985E-03

1.000E-09

1.3001E-03

-2.8860

2.9775E+02

3.3585E-03

1.140E-09

1.4822E-03

-2.8291

3.0390E+02

3.2906E-03

1.540E-09

2.0022E-03

-2.6985

3.0955E+02

3.2305E-03

2.240E-09

2.9123E-03

-2.5358

3.1450E+02

3.1797E-03

3.160E-09

4.1084E-03

-2.3863

3.1925E+02

3.1323E-03

6.000E-09

7.8808E-03

-2.1079

3.2325E+02

3.0936E-03

1.000E-08

1.3001E-02

-1.8860

3.2315E+02

3.0945E-03

1.770E-08

2.3012E-02

-1.6380

A plot of Log(vapour pressure) vs Reciprocal temperature gave a slope of -3664.755 and an intercept of 9.438.

The results obtained indicate the following vapour pressure relationship.

Log Vp (Pa) = -3664.755/Temp (K) + 9.438

Based on this equation, the Vapour pressure at 289.15K (25 °C) = 1.400E-03 Pa.

 

Run 2

Temperature (K)

Reciprocal Temperature (1/K)

Mass Difference (Kg)

Vapour Pressure (Pa)

Log Vp

2.9440E+02

3.3967E-03

4.400E-10

5.7206E-04

-3.2426

2.9865E+02

3.3484E-03

5.400E-10

7.0207E-04

-3.1536

3.0390E+02

3.2906E-03

7.000E-10

9.1009E-04

-3.0409

3.0955E+02

3.2305E-03

9.400E-10

1.2221E-03

-2.9129

3.1450E+02

3.1797E-03

1.400E-09

1.8202E-03

-2.7399

3.1945E+02

3.1304E-03

2.000E-09

2.6003E-03

-2.5850

3.2345E+02

3.0917E-03

2.880E-09

3.7444E-03

-2.4266

3.2565E+02

3.0708E-03

5.060E-09

6.5787E-03

-2.1819

3.3140E+02

3.0175E-03

9.600E-09

1.2481E-02

-1.9037

3.3150E+02

3.0166E-03

1.130E-08

1.4692E-02

-1.8329

 A plot of Log(vapour pressure) vs Reciprocal temperature gave a slope of -3612.451 and an intercept of 8.876.

The results obtained indicate the following vapour pressure relationship.

Log Vp (Pa) = -3612.451/Temp (K) + 8.876

Based on this equation, the Vapour pressure at 289.15K (25 °C) = 5.748E-04 Pa.

Run 3

Temperature (K)

Reciprocal Temperature (1/K)

Mass Difference (Kg)

Vapour Pressure (Pa)

Log Vp

2.9615E+02

3.3767E-03

7.000E-10

9.1009E-04

-3.0409

3.0125E+02

3.3195E-03

1.060E-09

1.3781E-03

-2.8607

3.0825E+02

3.2441E-03

1.000E-09

1.3001E-03

-2.8860

3.1225E+02

3.2026E-03

1.500E-09

1.9502E-03

-2.7099

3.1750E+02

3.1496E-03

2.000E-09

2.6003E-03

-2.5850

3.2005E+02

3.1245E-03

2.820E-09

3.6664E-03

-2.4358

3.2405E+02

3.0859E-03

3.700E-09

4.8105E-03

-2.3178

3.2765E+02

3.0520E-03

4.100E-09

5.3306E-03

-2.2732

3.3225E+02

3.0098E-03

5.020E-09

6.5267E-03

-1.1853

3.3750E+02

2.9630E-03

6.600E-09

8.5809E-03

-1.0665

A plot of Log(vapour pressure) vs Reciprocal temperature gave a slope of -2431.748 and an intercept of 5.134.

The results obtained indicate the following vapour pressure relationship.

Log Vp (Pa) = -2431.748/Temp (K) + 5,134

Based on this equation, the Vapour pressure at 289.15K (25 °C) = 9.426E-04 Pa.

The value from Run 3 was chosen to be the best estimate of vapour pressure since it was the most degassed sample.

Conclusions:
The vapour pressure of the test item at 25 °C was calculated to be 9.4E-04 Pa.
Executive summary:

The vapour pressure of the test item was determined using a vapour pressure balance as described in Method A.4 of Commission Directive 92/69/EEC. The vapour pressure of the test item at 25 °C was calculated to be 9.4E-04 Pa, based on extrapolation of the Log (Vapour pressure) vs 1/Temperature plot from the sample subjected to the most degassing.

Description of key information

The vapour pressure of the test item at 25 °C is 9.4E-04 Pa.

Key value for chemical safety assessment

Vapour pressure:
0 hPa
at the temperature of:
25 °C

Additional information

The vapour pressure of the test item was determined using a vapour pressure balance as described in Method A.4 of Commission Directive 92/69/EEC. The vapour pressure of the test item at 25 °C was calculated to be 9.4E-04 Pa, based on extrapolation of the Log (Vapour pressure) vs 1/Temperature plot from the sample subjected to the most degassing.