杭州室内空气中多氯联苯的污染特征研究

Research on the pollution characteristics of polychlorinated biphenyls in indoor air in Hangzhou

以杭州市室内空气为研究对象,对住宅和办公区域的室内空气中多氯联苯(Polychlorinated biphenyls,PCBs)的质量浓度水平、分布规律进行分析,并对其影响因素进行探究.结果表明:PCBs在所有室内空气样品中均能检测到,平均质量浓度为1 852 pg/m^3,三种类型室内空气PCBs质量浓度从高到低分别是办公区域、客厅和卧室,其质量浓度分别为2 700,1 398,1 298 pg/m^3,并且以三氯和四氯PCBs为主.高层建筑由于装修时间较短,通风良好等因素的影响,室内空气PCBs质量浓度略低于低层建筑.受PCBs污染的家用电器是室内空气PCBs的主要释放源,电器数量越多、使用时间越长,室内空气PCBs质量浓度越高.

This work investigated the concentration and the distribution of polychlorinated biphenyls（ PCBs） in indoor air of home and office,and the effect of possible factors on indoor air concentration.PCBs were detected in all samples and the mean concentration were 1 852 pg/m^3. The main components were trichlorobiphenyl and tetrachlorobiphenyl. The concentration of PCBs in office,living room and bedroom indoor air were 2 700,1 398,1 298 pg/m^3,respectively. The low-rise buildings had slight higher PCBs concentration than high-rise buildings,which might be caused by the decoration and air exchange. PCBs in indoor air were mainly from electric appliance which contaminated by PCBs. The concentration increased with the increase in the number and running time of electric appliance.