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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:
06 Nov 2017 - 25 Mar 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.022 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.039 Pa

Individual Results

The results of the isothermal TGA analysis for the test item and the vapour pressure at 20 °C and 25 °C are given in Tables below. The vapour pressure regression curve was:

log PT= -4573 x 1/T + 13.93 (r = 0.991, n = 8).

Results of the Vapour pressure Isothermal TGA Analysis

Temperature[°C]

Weight loss[µg/min]

νT[g/cm2/h]

log νT

log PT

PT[Pa]

50

0.577993

6.90E-05

-4.16

-0.19

0.65

 

0.541545

6.46E-05

-4.19

-0.23

0.59

60

1.30189

1.55E-04

-3.81

0.26

1.8

 

1.08335

1.29E-04

-3.89

0.16

1.4

70

2.53401

3.02E-04

-3.52

0.63

4.3

 

1.97872

2.36E-04

-3.63

0.49

3.1

80

5.51356

6.58E-04

-3.18

1.06

12

 

4.56534

5.45E-04

-3.26

0.96

9.1

Vapour Pressure of the Test Item

Temperature[°C]

log PT

PT[Pa]

PT

[mm Hg]

20

-1.67

2.2E-02

1.6E-04

25

-1.40

3.9E-02

3.0E-04

Conclusion

The isothermal TGA effusion method was applied for the determination of the vapour pressure of CD-3 / CAS 25646-71-3. The vapour pressure of the test item at 20 °C (293K) and 25 °C (298K) was:

 

Vapour Pressure at 20 °C

Vapour Pressure at 25 °C

 

(Pa)

(mm Hg)

(Pa)

(mm Hg)

Test Item

2.2E-02

1.6E-04

3.9E-02

3.0E-04

Description of key information

Vapor pressure is 2.2E-02 Pa at 20 ºC and 3.9E-02 Pa at 25 ºC (OECD 104, effusion method).

Key value for chemical safety assessment

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

Additional information