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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:
22 November 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
isoteniscope
Temp.:
20 °C
Vapour pressure:
0.76 kPa
Remarks on result:
other: Value extrapolated
Temp.:
25 °C
Vapour pressure:
0.95 kPa
Remarks on result:
other: Value extrapolated

The measured values are presented in Table 2. The lowest reliable vapour pressure is 4.06 kPa.

The vapour pressure curve (log p versus 1/T) was plotted. A line was fitted to the measured data (above 4.06 kPa) applying the least squares method. The vapour pressure was back calculated from the regression line for 20 and 25 °C.

Based on the simplified Clausius-Clapeyron equation a regression line was fitted on the measured data and the vapour pressure was extrapolated for 20 and 25 °C.

Table 2: Vapour Pressure of the Test Material

Temperature (°C)

Vapour Pressure 1 (kPa)

Vapour Pressure 2 (kPa)

Vapour Pressure 3 (kPa)

Mean (kPa)

20

-0.22

-0.24

-0.13

-0.20

25

0.10

0.09

0.23

0.14

30

0.47

0.46

0.63

0.52

35

0.84

0.87

1.08

0.93

40

1.30

1.31

1.55

1.39

45

1.79

1.79

2.06

1.88

50

2.33

2.31

2.63

2.42

55

2.95

2.94

3.27

3.05

60

3.65

3.61

3.99

3.75

65

4.45

4.40

4.83

4.56

70

5.38

5.31

5.74

5.48

75

6.42

6.30

6.84

6.52

80

7.59

7.45

8.02

7.69

85

8.90

8.72

9.33

8.98

90

10.37

10.12

10.76

10.42

95

12.03

11.72

12.38

12.04

100

13.80

13.40

14.05

13.75
Conclusions:
Under the conditions of the test, the extrapolated vapour pressure of the test material was determined to be 0.76 kPa at 20 °C and 0.95 kPa at 25 °C.
Executive summary:

The vapour pressure of the test material was determined using the isoteniscope method in a study conducted under GLP and in line with the standardised guidelines OCED 104 and EU Method A.4.

After filling approximately 1 mL of the test material into the sample cup, the stirring magnet was inserted into the cup and placed into the tester. Dissolved air was removed from the sample by evacuation at 20 °C. The vapour pressure as a function of temperature was registered in 20-100°C range in 5 °C steps.

The apparatus was calibrated by measuring the vapour pressure of the reference substance, ultra-pure water, in the 20-80 °C range in 5 °C steps. Measurements deviated from the literature values less than 10% above 25 °C, and therefore the measured values were accepted at 4.06 kPa and above.

The lowest reliable measured vapour pressure was 4.06 kPa. A vapour pressure curve (log p versus 1/T) was plotted. A line was fitted was applied to the measured data (above 4.06 kPa) applying the least squares method. The vapour pressure was back calculated from the regression line for 20 and 25 °C. Based on the simplified Clausius-Clapeyron equation a regression line was fitted on the measured data and the vapour pressure was extrapolated for 20 and 25 °C.

Under the conditions of the test, the extrapolated vapour pressure of the test material was determined to be 0.76 kPa at 20 °C and 0.95 kPa at 25 °C.

Description of key information

Vapour pressure 0.76 kPa at 20 °C, 0.95 kPa at 25 °C, OECD 104, EU Method A.4, Sárvári (2012c).

Key value for chemical safety assessment

Vapour pressure:
0.95 kPa
at the temperature of:
25 °C

Additional information

In the key study (Sárvári, 2012c) the vapour pressure of the test material was determined using the isoteniscope method in a study conducted under GLP and in line with the standardised guidelines OCED 104 and EU Method A.4. The study was assigned a reliability score of 1 in line with the principles of Klimisch (1997).

After filling approximately 1 mL of the test material into the sample cup, the stirring magnet was inserted into the cup and placed into the tester. Dissolved air was removed from the sample by evacuation at 20 °C. The vapour pressure as a function of temperature was registered in 20-100°C range in 5 °C steps.

The apparatus was calibrated by measuring the vapour pressure of the reference substance, ultra-pure water in the 20-80 °C range in 5 °C steps. Measurements deviated from the literature values less than 10% above 25 °C, and therefore the measured values were accepted at 4.06 kPa and above.

The lowest reliable measured vapour pressure was 4.06 kPa. A vapour pressure curve (log p versus 1/T) was plotted. A line was fitted was applied to the measured data (above 4.06 kPa) applying the least squares method. The vapour pressure was back calculated from the regression line for 20 and 25 °C. Based on the simplified Clausius-Clapeyron equation a regression line was fitted on the measured data and the vapour pressure was extrapolated for 20 and 25 °C.

Under the conditions of the test, the extrapolated vapour pressure of the test material was determined to be 0.76 kPa at 20 °C and 0.95 kPa at 25 °C.