中文摘要：

利用重液分离方法对自然水体中的生物膜、悬浮颗粒物和表层沉积物中的轻、重组分进行了分离,采用批量平衡法研究了各固相样品及其轻、重组分对六六六（HCHs）和滴滴涕（DDTs）的吸附特征,通过比较各组分对吸附的贡献,分析了固相样品吸附HCHs和DDTs的机制.结果表明,表层沉积物对HCHs和DDTs的吸附过程是沉积物中矿物表面和无定型有机质中的分配机制起主要作用,而对于结构更为复杂、非均质性程度更高的生物膜和悬浮颗粒物对HCHs和DDTs的吸附过程同时发生线性的分配作用和非线性的孔隙填充作用.

英文摘要：

Lighter and heavier components of biofilms,suspended particles and surface sediments in natural water were separated by cesium chloride solution with a specific gravity of 1.8.The sorption of HCHs and DDTs on the solid materials and their lighter and heavier components was investigated through a batch-equilibration method.Sorption mechanisms were analyzed by comparing the contribution of these separated components.The results indicate that HCHs and DDTs partition in the mineral surface and amorphous organic matter is the main sorption mechanism of surface sediments.The linear partition mechanism and nonlinear pore-filling mechanism were simultaneously taken place in HCHs and DDTs sorption on Biofims and suspended particles due to their great heterogeneity and containing more complex components and structures.