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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:
from 2017-06-23 to 2017-06-24
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
TOXI-COOP Toxicological Research Center Zrt., H-8230 Balatonfüred, Arácsi u. 97-99, Hungary (+5 further addresses in Hungary)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0.342 Pa
Temp.:
25 °C
Vapour pressure:
0.553 Pa

The vapour pressure was measured in the temperature range of 30 to 90 °C. For the evaluation the vapour pressure values in the range of 30 to 70 °C were used.

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

30

3.0240 x 10-3

8.7654 x 10-1

2

35

*

*

3

40

7.1264 x 10-3

2.0997

4

45

1.1349 x 10-2

3.3707

5

50

1.6917 x 10-2

5.0639

6

55

2.4916 x 10-2

7.5154

7

60

3.6702 x 10-2

11.155

8

65

5.4422 x 10-2

16.665

9

70

6.9932 x 10-2

21.573

* outlier, not used for the calculations

Regression data of the vapour pressure curve - Regression output

Date of measurement

Intercept

Slope

R. Squared

23 June 2017

12.0367

-3665.3514

0.9990
Conclusions:
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C:
Vapour pressure of the test item at 20 °C: 0.342 Pa
Vapour pressure of the test item at 25 °C: 0.553 Pa
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperatures between 30 and 90 °C using the effusion method (Knudsen cell).For the evaluation the vapour pressure values in the range of 30 and 70 °C were used. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 0.342 Pa at 20 °C and 0.553 Pa at 25 °C, respectively.

Description of key information

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C:

Vapour pressure of the test item at 20 °C: 0.342 Pa

Vapour pressure of the test item at 25 °C: 0.553 Pa

Key value for chemical safety assessment

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

Additional information

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item (reference 4.6-1). The vapour pressure of the test item was determined at temperatures between 30 and 90 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 30 and 70 °C were used. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 0.342 Pa at 20 °C and 0.553 Pa at 25 °C, respectively.