Abstract
Isosteric heats of phenanthrene sorption were calculated from isotherms measured at different temperatures on three natural soil materials having organic carbon fractions subjected to varying degrees of diagenetic alteration. The isotherms were highly nonlinear, and the sorption process became less exothermic with increased solid-phase loading. These observations are consistent with a classical surface adsorption reaction. However, isosteric heat values calculated using a pure supercooled solute standard state (-16.3 to +25.5 kJ/mol) were less exothermic than expected for a surface adsorption process and least exothermic for the sorbent having the highest sorption capacity
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