Sorption and Desorption of Phenanthrene to Black Carbon on Crop Soil from the South-North Water Diversion Project in China

摘要

The water quality of South-North Water Diversion Project (SNWDP) has attracted more and more attention. Polycyclic Aromatic Hydrocarbons (PAHs) in soils strongly sorb to black carbon. In this study, adsorption and desorption characteristics and isotherm of phenanthrene to black carbon in SNWDP crop soils were studied extensively. The results showed that the sorption and desorption of phenanthrene to black carbon were nonlinear. Freundlich model could ?t the sorption and desorption data of BC well. Meantime, desorption process exhibited varied apparent sorption-desorption hysteresis. It can be inferred that BC of crop soils in SNWDP plays a signi?cant role in reducing the bioavailability and toxicity of phenanthrene through sorption capacity and desorption hysteresis.