电子废物拆解与焚烧场地多溴联苯醚污染特征

Characterization of Polybrominated Diphenyl Ethers(PBDEs)in Dismantling and Burning Sites in Electronic Waste Polluted Area, South China

为了解不同类型电子废物场地土壤PBDEs污染的差异，对典型电子废物拆解和焚烧场地土壤中PBDEs的污染特征进行了比较研究。结果表明，拆解场地土壤中∑2。PBDEs含量为28．19-23517．27ng／g（dw），平均为5812．90ng／g（dw）；焚烧场地土壤中∑mPBDEs含量为5．27-22108．39ng／g（dw），平均为2282．98ng／g（dw）。2种类型污染场地土壤中PBDEs含量均较高，以拆解场地污染更为严重；2种场地均主要表现出十溴联苯醚工业品使用的污染特征，而焚烧场地还表现出了一定的八溴联苯醚工业品使用的污染特征。两种类型场地土壤中污染物均发生了垂向迁移，其中拆解场地土壤中PBDEs的纵向迁移能力更强。

In order to understand the pollution differences in different types of electronic waste sites, the levels and distributions of polybrominated diphenyl ether （PBDE） in surface soils and vertical variations of PBDEs in soil cores were investigated in dismantling and burning sites respectively. Results indicated that the concentrations of 21 congeners of PBDEs in dismantling site soils ranged from 28.19 to 23 517.27 ng/g（dw）, with mean 5 812.90 ng/g（dw） and that in burning site soils from 5.27 to 22 108.39 ng/g （dw） with average 2282.98 ng/g （dw） respectively. High PBDE pollutions occurred in these two contaminated sites, with relatively higher level in the dismantling site. The homologue composition of PBDEs showed that the dismantling site was mainly polluted by deca-BDE formulation, while burning site polluted by deca-BDE and octa-BDE formulations. At the same time, the vertical transports were considered to occur in the two types of sties according to the variation patterns of PBDEs along the soil profiles, of which stronger migration seem to occur in the dismantling site.