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首页> 外文期刊>Environmental toxicology and chemistry >AIR-VEGETATION PARTITIONING OF POLYCHLORINATED BIPHENYLS NEAR A POINT SOURCE
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AIR-VEGETATION PARTITIONING OF POLYCHLORINATED BIPHENYLS NEAR A POINT SOURCE

机译：点源附近的多氯联苯空气植被分配

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摘要

We investigated polychlorinated biphenyl (PCB) emissions to the environment from a waste treatment and transfer facility over the course of three years. We show that the facility, which undertakes PCB waste consolidation and maintains a low-yield incinerator for products such as light ballasts, acted as a point source for the spatial distribution of PCBs in vegetation. Concurrent air and vegetation sampling was performed to study the relationship between air-vegetation partitioning and the octanol-air partition coefficient (K_(OA)). We show evidence of equilibrium partitioning for lower-chlorinated congeners (log K_(OA) between 7 and 8.5), kinetically limited deposition on plants for intermediate congeners (log K_(OA) between 8.5 and 11), and particle-bound deposition for congeners with high log K_(OA) values ( > 11), consistent with the McLachlan partitioning model. From spring to autumn, heavier congeners become much more concentrated in samples farther away from the facility, possibly because of higher temperatures, which enhance dispersal of these congeners. Multivariate principal components analysis showed that PCB composition in vegetation near the emission source most closely resembled the Aroclor mixtures processed by the treatment facility.
机译：在三年的过程中，我们调查了废物处理和转移设施向环境中排放的多氯联苯（PCB）。我们表明，该工厂可以进行PCB废物的合并，并为轻质镇流器等产品维持低产量的焚化炉，它是PCB在植被中空间分布的点源。同时进行空气和植被采样以研究植被分配与辛醇-空气分配系数（K_（OA））之间的关系。我们显示了低氯同类物（log K_（OA）在7到8.5之间），中型同源物在植物上的动力学受限沉积（log K_（OA）在8.5和11之间）以及颗粒同类沉积的平衡分配证据。具有高log K_（OA）值（> 11），与McLachlan分区模型一致。从春季到秋季，较重的同类物会更多地集中在距离工厂较远的样品中，这可能是由于较高的温度导致了这些同类物的扩散。多元主成分分析表明，排放源附近植被中的PCB组成与处理设施处理的Aroclor混合物最为相似。

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