The Influence of Lipids on the Energetics of Uptake of Polycyclic Aromatic Hydrocarbons by Natural Organic Matter

摘要: Although most of the organic carbon in soils and sediments may be composed humic substances, their interaction with other compounds, especially sorption interactions, significantly affected by presence small amounts components natural matter (NOM). In this investigation, influence lipid fraction NOM on thermodynamics fluorene, phenanthrene, pyrene to several geosorbent samples was examined before after extraction lipids. Batch experiments were performed at same concentration for all polycyclic aromatic hydrocarbons (PAHs) (0.025 x solubility water) different temperatures (10, 20, 30, 40 degrees C), thermodynamic parameters calculated. Removal lipids increases capacity as well exothermicity process. The free energy change negative no significant differences noticed removal. entropy changes positive whole samples, but even smaller or more when removed. This indicates that PAHs absence extractable is stronger mechanisms involved different, changing from a partitioning-like mechanism specific adsorption. Because competition between sites, can viewed an "implicit sorbate."