Adsorption-desorption behaviors of phenanthrene on sediments from the Haihe River

Surface sediments from three typical sampling sites of the Haihe River and the Beiyunhe River and surface soil of Nankai University Garden were collected as sorbents,and sorption-desorption behaviors of phenanthrene onto/off of the different particles were experimentally investigated. The sorption of phenanthrene reached equilibrium in 2~12 hours,with a high sorption rate initially and a low sorption rate immediately thereafter. The sorption isotherm of phenanthrene could be described well by the linear equation and the Freundlich equation. The sorption amount of phenanthrene onto particles was directly proportional to the content of organic matter in the particles. The amount of phenanthrene sorbed by Geguzhen sediments which were sintered at a high temperature was much lower than that by the original sediment. Desorption hysteresis of phenanthrene on different sample particles were different,and the desorption hysteresis of phenanthrene on the sintered particles was more pronounced than on the natural particles. The differences in composition,structure and properties of organic matters of particles were the main factors affecting the desorption hysteresis behavior.