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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:
26 Mar - 19 Apr 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
adopted in March 04, 2016
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
adopted in March 23, 2006
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
adopted in August 1996
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Test item storage:
At room temperature protected from light
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
5.2 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
8.8 Pa

The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in Table 2 and Table 3.

The equation of the vapour pressure regression curve (log PT of the test item as function of the reciprocal temperatures) was: log PT = -4041 × 1/T + 14.5 (r = 0.998, n = 8).

 

Table 2: Results of the Vapour pressure Isothermal TGA Analysis

Temperature [°C]

Weight loss [μg/min]

vT

[g/cm2/h]

log vT

log PT

PT

[Pa]

40

14.6229

1.75 × 10-3

-2.76

1.61

40

 

13.7577

1.64 × 10-3

-2.78

1.57

37

50

28.5845

3.41 × 10-3

-2.47

1.98

95

 

29.1972

3.49 × 10-3

-2.46

1.99

98

60

61.2703

7.31 × 10-3

-2.14

2.40

250

 

61.0692

7.29 × 10-3

-2.14

2.40

250

70

105.708

1.26 × 10-2

-1.90

2.71

510

 

104.459

1.25 × 10-2

-1.90

2.70

500

 

Table 3: Vapour Pressure of the Test Item

Temperature

[°C]

log PT

PT

[Pa]

PT

[mm Hg]

20

0.71

5.2

3.9 × 10-2

25

0.95

8.8

6.6 × 10-2

 

Conclusion

The isothermal TGA effusion method was applied for the determination of the vapour pressure of N-ethylcaprolactam.

The vapour pressure of the test item at 20°C (293K) and 25°C (298K) was:

 

20°C (293K): 5.2 Pa = 3.9 × 10-2 mm Hg

25°C (298K): 8.8 Pa = 6.6 × 10-2 mm Hg

Description of key information

5.2 Pa at 20 °C, 8.8 Pa at 25 °C (isothermal thermogravimetry, OECD 104)

Key value for chemical safety assessment

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

Additional information