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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2016-04-11 to 2016-05-13
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:
adopted 23. Mar. 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
Council Regulation (EC) No 761/2009 of 24 August 2009
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
dated August 1996
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
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.001 Pa

Table 1Vapour Pressures (Effusion Method)

Experiment

T

Mean P

Stand. Dev. P

RSD P

No.

K

Pa

Pa

%

1

303.2

8.43E-04

1.05E-04

12.4%

2

318.2

2.88E-03

2.32E-04

8.0%

3

333.2

6.94E-03

1.30E-03

18.7%

In this table, E-0X represents multiplication with 10-x.

Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation

Conclusions:
The vapour pressure of the test item was determined at four different temperatures (30, 45, 60 and 75 °C) following EU A.4 using the effusion method (weight loss). Vapour pressure was calculated to be 3.93E-4 Pa at 20 °C and 5.9E-4 Pa at 25 °C, respectively.
Executive summary:

The vapour pressure of the test item was determined following OECD 104 and EU A.4 using the effusion method (weight loss). Vapour pressure was examined at four different temperatures (30, 45, 60 and 75 °C). Three temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (P). The graph 1/T vs. log (P) showed a straight line with a correlation coefficient of - 0.9977. For the test item, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation: Vapour pressure at 20 °C: 3.93E-4 Pa; Vapour pressure at 25 °C: 5.90E-4 Pa

Description of key information

The vapour pressure of the test item was determined at four different temperatures (30, 45, 60 and 75 °C) following EU A.4 using the effusion method (weight loss). Vapour pressure was calculated to be 3.93E-4 Pa at 20 °C and 5.9E-4 Pa at 25 °C, respectively.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item was determined following OECD 104 and EU A.4 using the effusion method (weight loss). Vapour pressure was examined at four different temperatures (30, 45, 60 and 75 °C). Three temperatures could be evaluated as they showed reproducible weight loss. For these temperatures, 1/T was plotted against log (P). The graph 1/T vs. log (P) showed a straight line with a correlation coefficient of - 0.9977. For the test item, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation: Vapour pressure at 20 °C: 3.93E-4 Pa; Vapour pressure at 25 °C: 5.90E-4 Pa

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