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首页> 外文期刊>Environment international >Impacts of sewage irrigation on heavy metal distribution and contamination in Beijing, China
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Impacts of sewage irrigation on heavy metal distribution and contamination in Beijing, China

机译：北京污水灌溉对重金属分布和污染的影响

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摘要

A potential hazard to Beijing was revealed due to the accumulation trend of heavy metals in agricultural soils with sewage irrigation, which results in metal contamination and human exposure risk. Samples including soils and plants were collected to assess the impacts of sewage irrigation on the irrigated farming area of Beijing. Concentrations of the five elements Cd, Cr, Cu, Zn, and Pb were determined in samples to calculate the accumulation factor and to establish a basis for environmental protection and the suitability of sewage irrigation for particular land use in the urban-rural interaction area of Beijing. Using reference values provided by the Beijing Background Research Cooperative Group in the 1970s, the pollution load index (PLI), enrichment factor (EF), and contamination factor (CF) of these metals were calculated. The pollution load indices (sewage irrigation land 3.49) of soils indicated that metal contamination occurred in these sites. The metal enrichment (EF of Cd 1.8, Cr 1.7, Cu 2.3, Zn 2.0, Pb 1.9) and the metal contamination (CF of Cd 2.6, Cr 1.5, Cu 2.0, Zn 1.7, Pb 1.6) showed that the accumulation trend of the five toxic metals increased during the sewage irrigation as compared with the lower reference values than other region in China and world average, and that pollution with Cd, Cu, Zn, and Pb was exacerbated in soils. The distributions of these metals were homogeneous in the irrigation area, but small-scale heterogeneous spatial distribution was observed. Irrigation sources were found to affect heavy metal distributions in soils. It was suggested that heavy metal transfer from soils to plants was a key pathway to human health exposure to metal contamination. However, with the expansion of urban areas in Beijing, soil inhalation and ingestion may become important pathways of human exposure to metal contamination.
机译：由于污水灌溉下农业土壤中重金属的积累趋势，揭示了对北京的潜在危害，这导致金属污染和人体暴露风险。收集包括土壤和植物在内的样本，以评估污水灌溉对北京灌溉农业区的影响。测定样品中Cd，Cr，Cu，Zn和Pb的五种元素的浓度，以计算其累积因子，并为环境保护和污水灌溉对城乡互动区特定土地的适用性奠定基础。北京。使用北京背景研究合作小组在1970年代提供的参考值，计算出这些金属的污染负荷指数（PLI），富集系数（EF）和污染系数（CF）。土壤的污染负荷指数（污水灌溉土地3.49）表明这些地点发生了金属污染。金属富集度（Cd 1.8，Cr 1.7，Cu 2.3，Zn 2.0，Pb 1.9的EF）和金属污染（Cd 2.6，Cr 1.5，Cu 2.0，Zn 1.7，Pb 1.6的CF）表明金属的富集趋势。污水灌溉过程中增加了5种有毒金属，其参考值低于中国其他地区和世界平均水平，并且土壤中Cd，Cu，Zn和Pb的污染加剧。这些金属在灌区中的分布是均匀的，但是观察到小规模的异质空间分布。灌溉源被发现会影响土壤中重金属的分布。有人提出，重金属从土壤到植物的转移是人类健康暴露于金属污染的关键途径。然而，随着北京城市面积的扩大，土壤的吸入和摄入可能成为人类暴露于金属污染的重要途径。

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