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首页> 外文期刊>Environmental Science & Technology >Using passive air samplers to assess urban - Rural trends for persistent organic pollutants. 1. Polychlorinated biphenyls and organochlorine pesticides
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Using passive air samplers to assess urban - Rural trends for persistent organic pollutants. 1. Polychlorinated biphenyls and organochlorine pesticides

机译：使用被动空气采样器评估城市-农村地区持久性有机污染物的趋势。 1.多氯联苯和有机氯农药

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Passive air samplers were used to investigate urban-rural differences of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) over an integrated time period. Samplers consisting of polyurethane foam (PUF) disks and semi-permeable membrane devices (SPMDs) were housed in protective chambers and deployed at six sites for a 4 month duration in the summer of 2000. The sampling transect originated in downtown Toronto and extended similar to75 km northward into a rural region. Results for the two types of samplers agreed well with one another. Higher blank levels were encountered for the SPMDs, especially for the OCPs, whereas blanks were very low for the PUF disks. Passive sampler-derived air concentrations were consistent with previous measurements of PCBs and OCPs in the region. The largest urban-rural gradient was observed for PCBs (similar to5-10 times). Chlordanes also showed an urban-rural gradient, possibly reflecting past usage of chlordane on residential lawns and emissions from treated house foundations. Other OCPs exhibited a rural-urban gradient (dieldrin, endosulfan 1, and DDT isomers), which was attributed either to off-gassing from previously treated agricultural soils (dieldrin and DDTs) or to continued usage in agriculture (endosulfan 1). The results of this study demonstrated the feasibility of using such devices to determine air concentrations of persistent organic pollutants (POPS) and to assess their spatial distribution for time integrated samples. Data such as this is essential for: model validation and for process research and addressing international monitoring strategies on POPS.
机译：被动空气采样器用于调查在一个完整的时间段内多氯联苯（PCB）和有机氯农药（OCP）的城乡差异。由聚氨酯泡沫（PUF）盘和半透膜装置（SPMD）组成的采样器放置在保护室内，并于2000年夏季在六个位置部署了4个月。采样样带起源于多伦多市中心，延伸类似于75向北进入乡村地区。两种采样器的结果彼此吻合。 SPMD（尤其是OCP）遇到了更高的空白级别，而PUF磁盘的空白非常低。被动采样器得出的空气浓度与该区域先前对PCB和OCP的测量一致。多氯联苯观察到最大的城乡梯度（约5-10倍）。氯丹还显示出城乡梯度，这可能反映了过去在住宅草坪上使用氯丹的情况以及经过处理的房屋基础的排放量。其他OCP表现出城乡梯度变化（狄氏剂，硫丹1和DDT异构体），这归因于先前处理过的农业土壤（狄氏剂和DDT）的脱气作用或在农业中的持续使用（硫丹1）。这项研究的结果证明了使用此类设备确定持久性有机污染物（POPS）的空气浓度并评估时间积分样本的空间分布的可行性。这样的数据对于以下各项至关重要：模型验证，过程研究以及解决关于POPS的国际监视策略。

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