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首页> 外文期刊>Limnology >Spatiotemporal changes in water quality along a historically metal-contaminated river: a retrospective analysis of 50 years of monthly monitoring data
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Spatiotemporal changes in water quality along a historically metal-contaminated river: a retrospective analysis of 50 years of monthly monitoring data

机译：沿着历史金属污染河流的时空变化水质的变化：每月监测数据50年的回顾性分析

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摘要

The Watarase River, running through Japan's northern Kanto region, has a long history of trace-metal contamination originating from the Ashio Copper Mine. Given the historical importance of incidents at this mine, understanding spatiotemporal environmental changes in the river, including changes in water quality, is important. By using long-term water-quality monitoring data (1960-2010), we aimed to reconstruct the spatiotemporal changes in six water-quality variables-the concentrations of three metals (copper, zinc, arsenic), biochemical oxygen demand (BOD), chemical oxygen demand (COD), and concentration of nitrate-nitrogen-along the Watarase River using generalized additive mixed models. The modeling results clearly demonstrate that during the 1960 and 1970s, metal pollution levels (as represented by copper and zinc) greatly decreased (from 450-2300 to 8-39 mu g Cu L-1 and from 490-1500 to 17-52 mu g Zn L-1), whereas organic pollution levels, as represented by the BOD and COD increased. Unique changes were observed in the cases of arsenic and nitrate-nitrogen (e.g., marked increases in the 1960s). From the 1980s until 2010, gradual decreases in the levels of metal and organic pollution were generally observed. Only in the 2000s were annual mean concentrations of copper in the lower reaches of the Watarase River lower than the US Environmental Protection Agency (EPA) water-quality criterion.
机译：通过日本的北方的北方的北方北方的北方北方的北方的北方北部的痕量金属污染历史悠久，源于亚太铜矿。鉴于事故发生在该矿井的历史重要性，了解河流的时空环境变化，包括水质的变化，是重要的。通过使用长期水质监测数据（1960-2010），我们旨在重建六种水质变量的时空变化 - 三种金属（铜，锌，砷），生物化学需氧量（BOD）的浓度，使用广义添加剂混合模型，化学需氧量（COD）和沿水杨酶沿着Watarase河流的浓度。建模结果清楚地表明，在1960年和20世纪70年代，金属污染水平（如铜和锌代表）大大降低（从450-2300至8-39μg，490-1500至17-52亩G Zn L-1），而有机污染水平，如BOD和COD所示。在砷和硝酸盐 - 氮的情况下观察到独特的变化（例如，20世纪60年代的标记增加）。从20世纪80年代到2010年，通常观察到金属和有机污染水平的逐渐减少。只有在2000年代的年度平均铜浓度，在Watarase River的下游低于美国环境保护局（EPA）水质标准。

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