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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:
28 November 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Comparable to guideline study (OECD104) with acceptable restrictions
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Remarks on result:
other: Calculated by extrapolation from higher temperatures.
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: Calculated by extrapolation from higher temperatures.

The vapour pressure was measured in the temperature range of 90 to 140 °C. For the evaluation the vapour pressure values in the range of 90 to 130 °C were used. The measured vapour pressure values together with the measured temperatures are listed inTable 1.


Table1:    Results of the Effusion method

























































No.



Temperature / °C



Vapour pressure / Pa



1



90



1.8227 ×10-2



2



95



7.3944 ×10-2



3



100



1.4564 ×10-1



4



105



2.7402 ×10-1



5



110



4.5141 ×10-1



6



115



8.7668 ×10-1



7



120



 2.4998



8



125



5.0630



9



130



5.5279




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


log10p = A + (B/T)


can be derived by regression of the data points to


A = 4.7452


B = -2759.92.


The vapour pressure is calculated by the software of the Vapor Pressure Analyzer applying the Hertz-Knudsen relation with correction factors that depend on parameters of the apparatus. Vapour Pressureare shown inTable2:


Table2:    Calculated vapour pressure values for 20, 25 and 50 °C



















Temperature / °C



Vapour pressure / Pa



20



3.151 ×10-8



25



1.032 ×10-7



Conclusions:
The vapour pressure at 20 °C was determined to 2.1 x 10E-5 Pa; at 25 °C to 3.1 x 10E-5 Pa.
Executive summary:

The vapour pressure of the Dimethoxydiphenyliodoniumbromid was calculated by extrapolation of the measured vapour pressure curve by the effusion method using a vapour pressure balance, according to Regulation EC 440/2008 Method A.4. Vapour Pressure.


Temperature / °C       Vapour pressure / Pa


20      3.151 ×10-8


25      1.032 ×10-7

Description of key information

The vapour pressure of the Dimethoxydiphenyliodoniumbromid was calculated by extrapolation of the measured vapour pressure curve by the effusion method using a vapour pressure balance, according to Regulation EC 440/2008 Method A.4. Vapour Pressure.


Vapour pressure: 3.151 ×10-8 Pa [T: 20 °C]


   

Key value for chemical safety assessment

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

Additional information