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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:
Experimental strating date: 16 August 2014 and Experimental Completion date: 19 August 2014.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23 March 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: OECD Guidelines for Testing of Chemicals
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: Commission Regulation (EC) N°440/2008 (as amended) of 30 May 2008, Part A: Methods for the determination of physico-chemical properties
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
other: Balance method
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: 5 runs were performed and the mean gave this Vapor pressure value.

Summary of vapor pressure Data.

 Run Log10 (Vp(25°C)) 
 2 -3.91 
 3 -4.02 
 4 -3.95 
 5 -4.03 
 Mean -3.98 
 Vapor pressure 1.1 x 10E-4 Pa 

The test item dd not change in appearance under the conditions used in the determination.

Discussion:

The un-shaded points on the garphs have not been used in the data analysis. The omission of these points is justified due to the fact that tipically, the first few points on a run can be erroneous due to the system undergoing a process of settling.

A total of 5 runs were completed for the main sequence. Equilibrium with regard to vapor pressure was assessed to have been reached over the final four runs. Thus the final four runs have been used to calculate the definitive vapor pressure value for the test item.

In conclusion, the vapor pressure of the test item has been determined to be 1.1 x10E-4 Pa at 25°C

Results:

Recorded temperatures, mass difference and the resulting calculated values of vapor pressure are shown in the following table:

Run 2

Temperature °C  Temperature K  Reciprocal Temperature (K-1)  Mass difference (microgr)  Mass difference (kg)  Vapor pressure (Pa)  Log10 Vp 
 103   376.15   0.002658514  194.69  1.947 E-07  0.270279599  -0.568186734
 104   377.15   0.002651465  208.07  2.081 E-07  0.288854467  -0.539320912
 105   378.15   0.002644453  237.33  2.373 E-07  0.32974844  -0.482177739
 106   379.15   0.002637479  252.90  2.529 E-07  0.351089993  -0.454581549
 107   380.15   0.002630541  266.98  2.670 E-07  0.370636640  -0.431051650
 108   381.15   0.002623639  286.95  2.870 E-07  0.398360116  -0.399724150
 109   382.15   0.002616774  317.80  3.178 E-07  0.441187820  -0.355376486
 110   383.15   0.002609944  330.88  3.309 E-07  0.459346211  -0.337859862

A plot of Log10 (vapor pressure (Pa)) versus reciprocal temperature (1/T (K)) for Run 2 gives the following statistical data using an unweighted least squares treatment

Slope: -4.81 x 10E3

Standard erro in slope: 203

Intercept: 12.2

Standard error in intercept: 0.536

The results obtained indicate the following vapor pressure relationship:

Log10 (Vp(Pa)) = -4.81 x 10E3/temp (K) +12.2

The above yields a vapor pressure (Pa) at 298.15 K with a common logarithm of -3.91.

Run 3

Temperature °C  Temperature K  Reciprocal Temperature (K-1)  Mass difference (microgr)  Mass difference (kg)  Vapor pressure (Pa)  Log10 Vp 
 103   376.15   0.002658514  202.58  2.026 E-07  0.281232941  -0.550933812
 104   377.15   0.002651465  214.36  2.144 E-07  0.297586599  -0.526386630
 105   378.15   0.002644453  226.84  2.268 E-07  0.314912036  -0.501810740
 106   379.15   0.002637479  243.22  2.432 E-07  0.337651673  -0.471531095
 107   380.15   0.002630541  264.49  2.645 E-07  0.367179882  -0.435121022
 108   381.15   0.002623639  294.54  2.945 E-07  0.408896981  -0.388386096
 109   382.15   0.002616774  321.80  3.218 E-07  0.446740845  -0.349944339
 110   383.15   0.002609944  347.36  3.474 E-07  0.482224673  -0.316750573

A plot of Log10 (vapor pressure (Pa)) versus reciprocal temperature (1/T (K)) for Run 3 gives the following statistical data using an unweighted least squares treatment

Slope: -4.97 x 10E3

Standard erro in slope: 216

Intercept: 12.6

Standard error in intercept: 0.570

The results obtained indicate the following vapor pressure relationship:

Log10 (Vp(Pa)) = -4.97 x 10E3/temp (K) +12.6

The above yields a vapor pressure (Pa) at 298.15 K with a common logarithm of -4.02.

Run 4

Temperature °C  Temperature K  Reciprocal Temperature (K-1)  Mass difference (microgr)  Mass difference (kg)  Vapor pressure (Pa)  Log10 Vp 
 103   376.15   0.002658514 196.09 1.961 E-07  0.272223158  -0.5
 104   377.15   0.002651465 216.06  2.161 E-07  0.299946634  -0.52
 105   378.15   0.002644453 231.37 2.313 E-07  0.321159189  -0.
 106   379.15   0.002637479 248.61 3.486 E-07  0.345134374  -0.4
 107   380.15   0.002630541 264.68 2.647 E-07  0.367443651  -0.43
 108   381.15   0.002623639 292.14 2.921 E-07  0.405565166  -0.3
 109   382.15   0.002616774 311.21 3.112 E-07  0.432039212  -0.3
 110   383.15   0.002609944 344.66 3.447 E-07  0.478476381  -0.3

A plot of Log10 (vapor pressure (Pa)) versus reciprocal temperature (1/T (K)) for Run 4 gives the following statistical data using an unweighted least squares treatment

Slope: -4.77 x 10E3

Standard erro in slope: 118

Intercept: 12.4

Standard error in intercept: 0.311

The results obtained indicate the following vapor pressure relationship:

Log10 (Vp(Pa)) = -4.87 x 10E3/temp (K) +12.4

The above yields a vapor pressure (Pa) at 298.15 K with a common logarithm of -3.95.

Run 5

Temperature °C  Temperature K  Reciprocal Temperature (K-1)  Mass difference (microgr)  Mass difference (kg)  Vapor pressure (Pa)  Log10 Vp 
 103   376.15   0.002658514 191.10 1.911 E-07  0.265295760  -0.576269692
 104   377.15   0.002651465 200.49 2.005 E-07  0.278331485  -0.555437663
 105   378.15   0.002644453 215.36 2.154 E-07  0.298974855  -0.524365336
 106   379.15   0.002637479 237.03 2.370 E-07  0.329058367  -0.482727062
 107   380.15   0.002630541 252.60 2.526 E-07  0.350673516  -0.455097033
 108   381.15   0.002623639 279.36 2.794 E-07  0.387823252  -0.411366157
 109   382.15   0.002616774 299.43 2.994 E-07  0.415685554  -0.381235068
 110   383.15   0.002609944 328.98 3.290 E-07  0.456708524  -0.340360882

A plot of Log10 (vapor pressure (Pa)) versus reciprocal temperature (1/T (K)) for Run 5 gives the following statistical data using an unweighted least squares treatment

Slope: -4.96 x 10E3

Standard erro in slope: 148

Intercept: 12.6

Standard error in intercept: 0.390

The results obtained indicate the following vapor pressure relationship:

Log10 (Vp(Pa)) = -4.97 x 10E3/temp (K) +12.6

The above yields a vapor pressure (Pa) at 298.15 K with a common logarithm of -4.03.

Conclusions:
The vapor pressure of the test item has been determined to be 1.1 x10E-4 Pa at 25°C
Executive summary:

The vapor pressure of the test item has been determined to be 1.1 x10E-4 Pa at 25°C, using the vapor pressure of Commission Regulation (EC) N° 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.

Description of key information

Key value for chemical safety assessment

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

Additional information

The vapor pressure of the test item has been determined to be 1.1 x10E-4 Pa at 25°C, using the vapor pressure of Commission Regulation (EC) N° 440/2008 of 30 May 2008 and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.