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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:
24 January 2017 to 03 May 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted in accordance with international guidelines and in accordance with Good Laboratory Practice. All relevant validity criteria were met,
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
30 May 2008 (as amended by Commission Regulation (EC) 761/2009)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
23 March 2006
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
gas saturation method
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
58.6 Pa
Remarks on result:
other: Constituent 1
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
14.3 Pa
Remarks on result:
other: Constituent 2
Key result
Transition / decomposition:
no

Results of the Main Vapour Pressure Determination for Constituent One

 Saturator Column

 Temp [°C]

 Volume V [mL]

 Mass of Test Item in Trap 1 [μg]

 Mass of Test Item in Trap 2 [μg]

 Total Mass of Test Item [μg]

 Vapor Pressure [Pa]

 Average Vapor Pressure [Pa] (Std Dev)

 A

 5

 45048

 2.61E+04

 0

 2.61E+04

 9.85

 

 B

 5

 59869

 3.44E+04

 0

 3.44E+04

 9.76

 9.83 (6.91E-02)

 C

 5

 75130

 4.38E+04

 0

 4.38E+04

 9.90

 

 A

 10

 34205

 2.98E+04

 0

 2.98E+04

 15.0

 

 B

 10

 45606

 3.90E+04

 0

 3.90E+04

 14.8

 14.8 (0.192)

 C

 10

 58024

 4.93E+04

 0

 4.93E+04

 14.7

 

 A

 15

 11545

 1.67E+04

 0

 1.67E+04

 25.5

 

 B

 15

 15419

 2.16E+04

 0

 2.16E+04

 24.6

 25.1 (0.425)

 C

 15

 19634

 2.80E+04

 0

 2.80E+04

 25.1

 

The regression data for the vapour pressure curve of constituent 1 are: Slope = -7492; Intercept = 29.20; r2 = 0.993

Results of the Main Vapour Pressure Determination for Constituent Two

Saturator Column

 Temp [°C]

 Volume V [mL]

 Mass of Test Item in Trap 1 [μg]

 Mass of Test Item in Trap 2 [μg]

 Total Mass of Test Item [μg]

 Vapor Pressure [Pa]

 Average Vapor Pressure [Pa] (Std Dev)

 A

 5

 209147

 3.60E+04

 0  3.60E+04  2.36  
 B  5  277719  4.80E+04  0  4.80E+04  2.37  2.46 (0.152)
 C  5  348349  6.67E+04  0  6.67E+04  2.63  
 A  10  75565  2.67E+04  0  2.67E+04  4.95  
 B  10  101343  3.56E+04  0  3.56E+04  4.92  4.94 (2.79E-02)
 C  10  127121  4.52E+04  0  4.52E+04  4.97  
 A  15  43946  1.77E+04  0  1.77E+04  5.72  
 B  15  58692  2.38E+04  0  2.38E+04  5.77  5.83 (0.147)
 C  15  73730  3.11E+04  0  3.11E+04  6.00  

The regression data for the vapour pressure curve of constituent 1 are: Slope = -6965; Intercept = 26.02; r2 = 0.887

The linearity of the detector response with respect to concentration was assessed over the concentration ranges of 11.9 to 238 mg/L (n = 6) for constituent one and 24.6 to 491 (n = 6) for constituent two. The results were satisfactory with a correlation coefficient (r2) of 1.000 being obtained for both constituents.

The concentrations in the sample solutions from traps 1 ranged between 83.6 and 246 mg/L for constituent one and between 178 and 400 mg/L for constituent two, therefore were approximately within the calibration ranges. For traps 2, no test item was detected.

Conclusions:
The vapour pressure of the test item has been determined to be 58.6 Pa at 25 °C for constituent one and 14.3 Pa at 25 °C for constituent two.
Executive summary:

The vapor pressure of of the test item was determined to be 58.6 Pa at 25 °C for constituent one and 14.3 Pa at 25 °C for constituent two, using the gas saturation method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 (as amended by Commission Regulation (EC) 761/2009) and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006.

Measurements were performed at 5, 10 and 15°C, showing good linear response, and the result at 25°C was extrapolated from the regression.

The vapor pressure of the test item has been determined to be 58.6 Pa at 25 °C for constituent one and 14.3 Pa at 25 °C for constituent two.

Description of key information

Vapour Pressure (constituent 1): 58.6 Pa at 25 °C; EU Method A.4; Anon. (2017)

Key value for chemical safety assessment

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

Additional information

The vapor pressure of Reaction Mass of the test item was determined to be 58.6 Pa at 25 °C for constituent one and 14.3 Pa at 25 °C for constituent two, using the gas saturation method, designed to be compatible with Method A.4 Vapour Pressure of Commission Regulation (EC) No 440/2008 of 30 May 2008 (as amended by Commission Regulation (EC) 761/2009) and Method 104 of the OECD Guidelines for Testing of Chemicals, 23 March 2006. Measurements were performed at 5, 10 and 15°C, showing good linear response, and the result at 25°C was extrapolated from the regression.

For constituent 1, the vapour pressure of 58.6 Pa ( 25 °C) is used for chemical safety assessment.