估算多氯联苯在鱼体中生物富集因子的片段常数法  

A FRAGMENT CONSTANT METHOD FOR PREDICTION OF BCF OF PCB IN FISH

作　　者：胡海瑛[1] 卢晓霞[1] 陶澍[1] 

机构地区：[1]北京大学城市与环境学系,北京100871

出　　处：《环境化学》2000年第2期159-164,共6页Environmental Chemistry

基　　金：国家自然科学基金重点项目(49632060);国家杰出青年基金(49525102)资助项目

摘　　要：根据40种PCB的实测数据建立了估算PCB在鱼体中生物富集系数的片段常数模型.建模化合物的lg BCF在2.65—5.97之间,lg K_(ow)则在3.88—8.18之间.由于特定氯取代位的影响以及在此K_(ow)范围内BCF与化合物憎水性之间的非线性关系,简单的片段常数模型不能有效估算BCF.通过引入特定结构因子对化合物空间结构对生物富集的影响进行校正,建立了BCF的非线性片段常数估算模型,模型可决系数0.889,平均绝对误差0.223个对数单位.采用jackknife方法对模型稳健性进行检验.A fragment constant model was developed for predicting PCB' s BCF in fish based on measured BCFs of 40 congeners covering a wide range of physiochemical properties. Their log transformed 1-octoalcohol/water partition coefficients (Kow) vary from 3.88 to 8.18. The steric effect of molecular size, which usually causes a nonlinear relationship between IgBCF and lgKow, was adjusted by introducing two stuctural factors. A modified jackknife test was performed to validate model robustness.

关 键 词：片段常数 多氯联苯 生物富集因子 鱼体 生物监测 

分 类 号：X17[环境科学与工程—环境科学]