电子废物拆解区农业土壤中多溴二苯醚的分布与来源

用GC-NCI-MS测定了浙江台州路桥表层农业土壤中41种多溴二苯醚(PBDEs)的含量, 并对其分布及来源进行了分析.结果表明:所有样品中Σ41PBDEs的含量为0.193~91.0ng/g,平均值为8.96ng/g,其中BDE209的含量为0.0452 ~ 61.5ng/g,平均值为5.41ng/g.在多数样品中十溴BDE及九溴BDEs是主要的同族体,四溴和七溴BDEs同族体次之.同族体组成特征和聚类分析表明,多数采样点主要受到deca-BDE工业品的污染,另有一些采样点受到octa-BDE和deca-BDE工业品的污染,个别采样点主要受到penta-BDE工业品污染.与国内外相关研究相比,研究区域内土壤中PBDEs的污染水平较低,但少数采样点受点源污染影响较大.

Distribution and possible sources of PBDEs in agricultural soils from an electronic waste recycling area

The concentrations of 41 polybrominated diphenyl ethers (PBDEs) in the agricultural soils from Luqiao were analyzed by GC-NCI-MS,and their distribution and possible sources were also investigated. The total concentrations of 41 PBDEs (Σ41PBDEs) in soils ranged from 0.193 to 91.0 ng/g dry weight, with a mean of 8.96 ng/g,and the concentrations of BDE209 were from 0.0452 to 61.5 ng/g dry weight, with a mean of 5.41 ng/g. Deca-BDE and nona-BDEs were the predominant homologues in most of samples, followed by tetra-BDEs and hepta-BDEs. The homologue composition and cluster analysis showed that most of sampling sites were polluted by deca-BDE formulation, and others polluted by octa-BDE and deca-BDE formulations. Comparing with other studies, the levels of PBDEs in the present study were lower, but it should be concerned that a few of sampling sites were highly contaminated.