Iodomethane

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

06 July 2011 to 21 July 2011

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

GLP compliance:

yes (incl. QA statement)

Type of method:

dynamic method

Temp.:

ca. 20 °C

Vapour pressure:

ca. 440.9 hPa

Temp.:

ca. 25 °C

Vapour pressure:

ca. 538 hPa

Temp.:

ca. 50 °C

Vapour pressure:

ca. 1 317.9 hPa

Thermal Stability

- A DSC-measurement in closed glass crucible showed no thermal response in the temperature range 30 - 180 °C. After the measurement the test material in the container was evaporated and transformed to slightly violet coloured gas.

Vapour Pressure (Dynamic Method)

The vapour pressure was measured with the dynamic method in the temperature range of 18 °C to 42 °C.

- The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C.

Table 1: Measured Vapour Pressures

Temperature (°C)	Vapour Pressure (hPa)
17.7	401.3
19.3	428.8
22.1	479.8
25.5	549.5
27.9	599.6
29.9	647.1
33.7	749.0
36.3	824.2
38.9	901.0
42.0	1007.1

 

Table 2: Calculated Vapour Pressures

Temperature (°C)	Pressure (hPa)	Pressure (Pa)
20	440.9	4.4 x10^4
25	538.0	5.4 x10^4
50	1317.9	1.3 x10^5

 

Conclusions:

Under the conditions of this study, the vapour pressure was measured with the dynamic method in a temperature range of 18-42 °C and values of 440.9 hPa, 538.0 hPa and 1317.9 hPa were calculated for temperatures of 20, 25 and 50 °C respectively.

Executive summary:

The vapour pressure of the test material was investigated in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions.

Under the conditions of this study, the vapour pressure was measured with the dynamic method in a temperature range of 18-42 °C and values of 440.9 hPa, 538.0 hPa and 1317.9 hPa were calculated for temperatures of 20, 25 and 50 °C respectively.

Description of key information

Dornhagen (2011)

Under the conditions of this study, the vapour pressure was measured with the dynamic method in a temperature range of 18-42 °C and values of 440.9 hPa, 538.0 hPa and 1317.9 hPa were calculated for temperatures of 20, 25 and 50 °C respectively.

Key value for chemical safety assessment

Vapour pressure:

538 hPa

at the temperature of:

25 °C

Additional information

Dornhagen, 2011

The vapour pressure of the test material was investigated in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

Under the conditions of this study, the vapour pressure was measured with the dynamic method in a temperature range of 18-42 °C and values of 440.9 hPa, 538.0 hPa and 1317.9 hPa were calculated for temperatures of 20, 25 and 50 °C respectively.

Brookman & Curry, 2002

According to literature data, the vapour pressure of the test material, is 235 torr at 11.7 °C, and 569 torr at 34.4 °C. By interpolation, the vapour pressure at 25 °C is 410 torr.