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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 Jul - 11 Sep 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2008
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996
GLP compliance:
no
Type of method:
dynamic method
Remarks:
Vapour-liquid equilibrium
Key result
Temp.:
20 °C
Vapour pressure:
0.52 hPa
Temp.:
25 °C
Vapour pressure:
0.67 hPa
Temp.:
50 °C
Vapour pressure:
2.1 hPa

Results

The vapour pressure was measured in the temperature range of 100.8 to 158.8 °C. The measured vapour pressure values together with the measured temperatures are listed Table 1.

 Table 1: Results of the dynamic method

No.

Temperature / °C

Vapour pressure / hPa

Remark

1

100.8

13.6

Measured up

2

113.8

19.8

Measured up

3

135.8

34.9

Measured up

4

143.2

40.8

Measured up

5

150.8

54.4

Measured up

6

158.8

69.0

Measured up

7

146.8

48.8

Measured down

8

124.3

27.2

Measured down

9

116.3

21.5

Measured down

 

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

  Log10 p = A +  B / ( C + θ )

Can be derived by regression (Microsoft excel) of the data points

A = 8.2394

B = -1912.43

C = 273.15

Final results

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC 440/2008 Method A.4. Vapour Pressure.

Table 2: Calculated vapour pressure values for 20, 25 and 50 °C

 Temperature / °C

Vapour pressure / hPa

20

0.52

25

0.67

50

2.10

     

Conclusions:
Vapour pressure values of 0.52 hPa (at 20 °C), 0.67 hPa (at 25 °C) and 2.10 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.52 hPa at 20 °C, 0.67 hPa at 25 °C, 2.10 hPa at 50 °C (EU Method A.4, vapour-liquid equilibrium)

Key value for chemical safety assessment

Vapour pressure:
0.52 hPa
at the temperature of:
20 °C

Additional information

According to Regulation EC No. 440/2008 Method A.4, the vapour pressure values of the test item for the temperatures 20, 25 and 50 °C were calculated by extrapolation of the measured vapour pressure curve.