Registration Dossier
Registration Dossier
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EC number: 268-615-9 | CAS number: 68131-33-9 The solution formed by reacting the sodium salts of green liquor with calcium hydroxide.
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
- Using the static method, a vapour pressure of 2049 Pa at 20 °C and 2695 Pa at 25 °C was measured (EU 440/2008 A.4, OECD 104).
- These values were calculated from the regression of 17 individual measurements.
Key value for chemical safety assessment
- Vapour pressure:
- 2 049 Pa
- at the temperature of:
- 20 °C
Additional information
Using the static method, a vapour pressure of 2049 Pa at 20 °C and 2695 Pa at 25 °C was measured. These values were calculated from the regression equation of 17 individual measurements. The test item is an aqueous solution. The dry solids/water ratio of the tested sample was 17/83 % by weight.
The values recorded at increasing and at decreasing temperatures showed differences at lower temperatures. The test item White liquor may have decomposed during the heating phase. Another explanation for the differences could be either a contamination with substances with lower boiling point or incomplete degassing. The latter is implausible, though, as multiple degassing steps were performed before measurements.
If only the temperatures between 25.0 and 33.4 °C were considered, marginally different vapour pressures would have been calculated (1959 Pa at 20 °C and 2634 Pa at 25 °C). This difference was assessed as uncritical.
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