[Effect of dissolved organic matter on phenanthrene sorption-desorption in soil system].

Batch experiments were conducted to investigate effect of dissolved organic matter (DOM) on the adsorption and desorption behavior of Phenanthrene (Phe) in a soil-water system. It was found that three natural DOM derived from pig manure (PM), sewage sludge (SS), green manure (GM) and a kind of surfactant Tween-80 can reduced sorption of Phenanthrene significantly onto the tested soil. Within the selected concentration of the Phenanthrene and DOM in this study, the sorption quantity has a negative-linear correlativity with the concentration of DOM (r(PM) = - 0.988 8, r(SS) = - 0.982 6, r(Tween-80 = - 0.974 3, r(GM) = - 0.990 5). The inhibition of Phenanthrene sorption caused by DOM of PM origin was more significant than that of SS origin and GM origin for the same soil. Phenanthrene sorption isotherm could be described well by the Freundlich equation. It implied that DOM can affect the environmental behaviors of Phenanthrene in soil.