多环芳烃在黑土有机-矿质复合体中的老化行为

Aging Behaviour of Polycyclic Aromatic Hydrocarbons in Organo-Mineral Aggregates from Black Soil

研究多环芳烃菲和蒽在黑土不同粒径有机-矿质复合体中的老化现象，采用二氯甲烷提取法测定老化后多环芳烃菲和蒽的可提取性，比较不同粒径有机-矿质复合体中老化的速率．实验结果表明，老化90d后，菲的可提取率下降10％，蒽的可提取率下降30％，粘粒级复合体中最初阶段（0～15d）的老化速率最高，其余粒径复合体老化速率最高阶段基本都在15～28d．

Aging behaviour of polycyclic aromatic hydrocarbons （PAHs） phenanthrene and anthracene in organo-mineral aggregates from black soil were studied under laboratory incubation. Changes in their extractability and aging rate in different fractions of organo-mineral aggregates were determined through extraction by dichloromethane. After incubation for 90 days, the extractability of phenanthrene and anthracene were seen to be decreased about 10% and 30%, respectively. In clay fractions, the aging rate in the first period （from 0 to 15 days） appeared highest, while in the other three fractions, the higher aging rates existed basically in the period from 15 to 28 days.