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Physical & Chemical properties

Vapour pressure

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vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2006-09-14 to 2006-09-17
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Data for purity and stability are missing
according to guideline
EU Method A.4 (Vapour Pressure)
Version / remarks:
, 1992
GLP compliance:
yes (incl. QA statement)
signed 2005-11-21
Type of method:
effusion method: vapour pressure balance
25 °C
Vapour pressure:
< 0.007 Pa
Remarks on result:
other: The test material did not change in appearance under the conditions used in the determination.
Transition / decomposition:

No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of maximum value for vapour pressure at 25 °C. Run 5 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 127 °C (400.15 K) was chosen because this is the data point which gives the highest estimated vapour pressure at any given temperature when a slope of -1500 K is imposed upon it. The value of -1500K is an in-house value and is the shallowest slope observed whilst determining the vapour on a wide range of samples using the vapour pressure balance method. Extrapolation to 25°C gave a vapour pressure of 6,909 x 10 -3Pa which has been taken as a maximum for this material.

The vapour pressure of the test material has been determined to be less than 7.0 x 10^-3 pa at 25 °C

Description of key information

The vapour pressure of Cobalt(II) 4-oxopent-2-en-2-olate has been determined to be less than 0.007 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0.007 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure of Cobalt(II) 4-oxopent-2-en-2-olate has been determined to be less than 0.007 Pa at 25 °C.