Sorption Properties of PAH(Phenanthrene)on Sediment in West Lake

Sorption /desorption properties o f phenanthrene on sediment in West Lake were studied.Both sorption and desorption can reach equilibriumin less than 8hour s.Under the conditions of the presen t experiment,the sorption of phenan threne on sediment was characterized bySisothermand may be well described by Freundlich equation.It was reflected that there was symmetrical surface in the sediment.It was found that the cu rves of multi -step sorption /desorp tion experiments were step -wise and phenanthrene irre-versibly adsorbed onto the sediment .It may be explained that the irreversible sorption was caused by the high content of organic matters in the sediment.