多环芳烃类化合物在土壤上的吸附

Adsorption of polycyclic aromatic hydrocarbons on soils

研究了几种多环芳烃化合物在土壤上的吸附行为．通过一个连续投药－取样试验装置，在没有任何其它有机试剂干扰的情况下，测定了荧蒽与菲在土壤上的吸附量．研究表明，这两种多环芳烃化合物在土壤上的吸附量与土壤有机质含量之间呈显著相关．对多环芳烃化合物的分子结构及理化特性，如辛醇－水分配系数、溶解度等参数与ＬｏｇＫｏｃ关系的研究发现多环芳烃化合物的ＬｏｇＫｏｃ与化合物的水溶性、辛酸－水分配系数以及分子结构中的苯环数线性相关．

The adsorption of several polycyclic aromatic hydrocarbons (PAHs) on soils is studied in this paper. Through a continuous applying-sampling apparatus, the adsorption of fluoranthene and phenanthrene on soils from both China and abroad is measured without the interference of any other organic solvents. The results show that adsorption of fluoranthene and phenenthrene on soil correlated significantly with organic carbon contents of soils used as adsorbents. Investigations on the relations between LogKoc and molecular structure, LogKoc and physico-chemical characteristics of chemicals, such as octanol-water partition coefficients (Kow) and aquatic solubility (Sw) show that LogKoc is linearly correlated with LogSw, LogKow and the number of benzene loops in the molecular structure of PAHs.