Registration Dossier
Registration Dossier
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EC number: 247-728-7 | CAS number: 26479-35-6
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
In accordance with Column 2 of Annex VII of Regulation (EC) No. 1907.2006, if the melting point is between 200 deg C and 300 deg C, a limit value based on measurement or a recognised calculation method is sufficient. In a melting/boiling point study performed according to the capillary method (SOP 013.03 Issue No, 1 issued Nov 2009), potassium allophonate sublimed at 298.3 deg C and, therefore, the melting/freezing temperature cannot be technically determined. However, given the high stability of potassium allophonate up to this temperature, the vapour pressure of potassium allophonate is low and calculation of a limit value is still appropriate. MPBVP v1.43, found in EPIWIN v4.10, estimates at vapour pressure of 1.09E-11 mm Hg (1.46E-09 Pa) at 25 deg C, indicating that potassium allophonate has a negligible volatility.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
Since potassium allophonate underwent sublimation at 298.3 deg C prior to the onset of melting, it is appropriate to estimate a limit value of the vapour pressure using accepted methods. MPBVP v1.43, found in EPIWIN v4.10 (U.S. EPA, 2013), was used to estimate the vapour pressure of potassium allophonate. An experimentally-determined log octanol water coefficient of ≤ -1.08 and a melting/freezing point value of 298.3 deg C (experimentally-determined sublimation temperature) were manually entered into the model as inputs. All parameters used in the calculations were the default values found in EPIWIN. The model estimates a vapour pressure of 1.09E-11 mm Hg (1.46E-09 Pa) at 25 deg C, indicating that this substance is highly non-volatile. This result is expected given the high capacity for hydrogen bonding and the ionic nature of potassium allophonate at environmentally-relevant pH.
Reference:
United States Environmental Protection Agency (U.S. EPA). 2013. Estimation Programs Interface Suite™ for Microsoft® Windows, v 4.10. United States Environmental Protection Agency, Washington DC, USA.
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