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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:
02 to 06 June 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
other: OECD Test Guideline 113 (1981): Screening Test for Thermal Stability and Stability in Air
Qualifier:
according to guideline
Guideline:
other: EPA OCSPP Test Guideline 830.7950 (1996): Vapor Pressure
GLP compliance:
no
Type of method:
dynamic method
Key result
Temp.:
20 °C
Vapour pressure:
0.11 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.16 hPa
Key result
Temp.:
50 °C
Vapour pressure:
0.73 hPa

Results

 

 

Thermal Stability

The test item showed no thermal effects in the temperature range of 25 – 300 °C.

 

Dynamic method: Vapour-liquid equilibrium (VLE)

The vapour pressure was measured in the temperature range of 97.0 to 170.7 °C, results are reported in the table below.

 

Results of the dynamic method

No.

Temperature / °C

Vapour pressure / hPa

Remark

1

97.0

7.5

measured up

2

129.4

25.1

measured up

3

145.5

44.8

measured up

4

156.2

64.7

measured up

5

164.3

84.5

measured up

6

170.7

104.6

measured up

7

165.8

89.8

measured down

8

153.5

59.8

measured down

9

132.3

29.7

measured down

 

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

 

               Log10p = A + (B / (C + Θ))

 

can be derived by regression (Microsoft Excel):

A = 9.7612

B = -2552.84

C = 273.15

 

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 No. 440/2008 Method A.4. Vapour Pressure are shown in the table below.

 

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

Temperature / °C

Vapour pressure / hPa

20

0.11

25

0.16

50

0.73

 

 

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 No. 440/2008 Method A.4. The resulting vapour pressures are 0.11, 0.16 and 0.73 hPa, respectively.

Conclusions:
Vapour pressure values of 0.11 hPa (at 20 °C), 0.16 hPa (at 25 °C) and 0.73 hPa (at 50 °C) were determined for the test substance according to E.U. Method A.4.

Description of key information

Vapour pressure: 0.11 hPa at 20 °C, 0.16 hPa at 25 °C, and 0.73 hPa at 50 °C (EU Method A.4., dynamic method)

Key value for chemical safety assessment

Vapour pressure:
0.16 hPa
at the temperature of:
25 °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.