Abstract
Several assumptions in a theoretical model for adsorption of polycyclic aromatic hydrocarbons on fly ash have been examined experimentally. Direct measurement of adsorption using elution analysis with gas-solid chromatography has been made for six PAH on fly ash from a municipal incinerator and a coalfired power plant. Results show adsorption is rapid, isotherms are non-linear and irreversible adsorption occurs at concentrations below 30 μg PAH per gram of fly ash. However, at concentrations above 30 μg g−1 mechanisms of adsorption for PAH are governed largely by vapor pressures. A new model which is based on these experimental results is proposed.
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