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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:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline validity criteria were met.
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Regulation (EC) 440/2008 of 30 May 2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
11 July 2006
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
Remarks on result:
other: extrapolated
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: extrapolated
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0 Pa
Remarks on result:
other: extrapolated

Vapour Pressure – Effusion method: Knudsen cell

The vapour pressure was measured in the temperature range of 66 to 96 °C. The measured vapour pressure values together with the measured temperatures are listed in Table 2:

 

Table 2:          Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

66

3.61 × 10-3

2

71

6.79 × 10-3

3

76

1.18 × 10-2

4

81

2.21 × 10-2

5

86

4.00 × 10-2

6

91

6.81 × 10-2

7

96

1.10 × 10-1

 

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation:

 

Log10p = A + B/T = A + B/C + t

 

Where:

p = vapour pressure

A = constant

B = slope of the line

T = temperature (Kelvin)

C = 273.15 K

t = temperature (Celcius)

 

 

Table 3:          Linear Regression Data Points

A

15.9008

B

-6216.55

C

273.15

 

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006) is shown in Table 4:

 

Table 4:          Calculated vapour pressure values for 20, 25 and 50 °C

Temperature / °C

Vapour pressure / Pa

20

5.0 × 10-6

25

1.1 × 10-5

50

4.6 × 10-4

 

Conclusions:
The vapour pressure of the test item has been determined to be 5 x 10-6 Pa at 20.0 °C.
Executive summary:

EU Method A.4. – The vapour pressure of the test item was determined utilising the effusion method.  The procedure employed was designed to be compatible with Method A.4. Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008.

The vapour pressure of the test item was measured across a temperature range of 66 °C to 96 °C.  Values measured across this range showed a good linear response.  The test item vapour pressure at 20 °C, 25 °C and 50 °C was extrapolated from a regression of measured values.  

The vapour pressure of the test item has been determined to be 5 x 10-6 Pa at 20.0 °C.

Description of key information

Vapour Pressure: 0.000005 Pa at 20°C; EU Method A.4.; K Kremer (2017)

Key value for chemical safety assessment

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

Additional information

EU Method A.4. – The vapour pressure of the test item was determined utilising the effusion method.  The procedure employed was designed to be compatible with Method A.4. Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008.

The vapour pressure of the test item was measured across a temperature range of 66 °C to 96 °C.  Values measured across this range showed a good linear response.  The test item vapour pressure at 20 °C, 25 °C and 50 °C was extrapolated from a regression of measured values.  

The vapour pressure of the test item has been determined to be 5 x 10-6 Pa at 20.0 °C.