污染区大气中多氯联苯的表征与分布研究初探

PRELIMINARY STUDY OF THE CHARACTERIZATION ANDDISTRIBUTION OF PCB CONGENERS BETWEEN VAPORPHASE AND AEROSOLS IN POLLUTED AREA

通过采集并分析污染区大气及大气颗粒物中PCBs的含量,揭示了污染区空气中PCBs的残留量,讨论了各样品中PCBs的组成及分布,气相样品中可检出的PCBs总浓度在191—64ng·m^(-3),颗粒物中可检出的PCBs同类物总浓度为0.191—0.373μg·g^(-1)并对气相与颗粒物PCBs浓度的关系进行了初步探讨.对同类物分布的研究表明,无论气态还是大气颗粒物中低氯代的PCBs同类物都是其主要成份.

Chromatographically well-separated PCB congeners were analyzed in vapor phase and particu-late collected in a polluted area. The PCB mixture was dominated by congeners with low degree of chlorination in the vapor phase and aerosols. The vapor phase represented most of total atmospheric concentrations for the most volatile congeners. The concentration of PCBs in vapor phase is 191-641 ng·m-3 while it in the aerosols is 0.20-0.37μg·g-1