| Title: | A semiempirical correlation between enthalpy of vaporization and saturation concentration for organic aerosol |
| Author(s): | Epstein SA; Riipinen I; Donahue NM; |
| Address: | "Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA" |
| ISSN/ISBN: | 0013-936X (Print) 0013-936X (Linking) |
| Abstract: | "To model the temperature-induced partitioning of semivolatile organics in laboratory experiments or atmospheric models, one must know the appropriate heats of vaporization. Current treatments typically assume a constant value of the heat of vaporization or else use specific values from a small set of surrogate compounds. With published experimental vapor-pressure data from over 800 organic compounds, we have developed a semiempirical correlation between the saturation concentration (C*, microg m(-3)) and the heat of vaporization (deltaH(VAP), kJ mol(-1)) for organics in the volatility basis set. Near room temperature, deltaH(VAP) = -11 log(10)C(300)(*) + 129. Knowledge of the relationship between C* and deltaH(VAP) constrains a free parameter in thermodenuder data analysis. A thermodenuder model using our deltaH(VAP) values agrees well with thermal behavior observed in laboratory experiments" |
| Keywords: | "Aerosols Linear Models Models, Chemical Phase Transition *Thermodynamics Volatilization;" |
| Notes: | "MedlineEpstein, Scott A Riipinen, Ilona Donahue, Neil M eng Research Support, Non-U.S. Gov't 2009/12/23 Environ Sci Technol. 2010 Jan 15; 44(2):743-8. doi: 10.1021/es902497z" |
