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首页> 外文期刊>Journal of Environmental Science and Health >Scenarios of metal concentrations in the Arcediano Dam (State of Jalisco, Mexico)
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Scenarios of metal concentrations in the Arcediano Dam (State of Jalisco, Mexico)

机译：阿尔塞迪亚诺大坝（墨西哥哈利斯科州）中金属浓度的情景

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The city of Guadalajara, Jalisco, Mexico has 4.1 million inhabitants and a serious deficit in water supply. Once constructed, the Arcediano Dam will catch waters from the Verde and Santiago rivers, and after treatment will provide water to the city. The present study was undertaken to formulate scenarios and estimate risks of polluting the water that will be collected in the dam from the release of contaminants accumulated in sediments. Desorption of metals from sediments was estimated through sampling of water and sediments, chemical analyses of the environmental samples, and numerical modeling of the water-sediment interactions. Water quality generally increased as the river flowed downstream from the El Salto sampling station to the site where the Arcediano Dam will be constructed. Aluminum exceeded the Mexican Criterion for Drinking Water Supply (MCDWS), at all sampling stations, whereas iron and manganese surpassed the criteria at some stations. Trace metals were below their respective criteria. For sediment samples in the river, chrome, copper and zinc exceeded the Canadian Interim Sediment Quality Guidelines (ISQG), whereas manganese and nickel exceeded the probable effect level (PEL). Other metals were below these limits. With exception of the El Salto sampling station, metals were mostly enriched in iron-containing sediments, followed by aluminum-containing clays and, to a lesser extent, by manganese oxides. Therefore, the interaction of metals with iron oxides was considered as the controlling adsorption mechanism. Simulations to estimate risks of water contamination by desorption of metals from sediments indicate that manganese and nickel may reach concentrations higher than the CDWS. In some cases, dissolved concentrations of lead and chrome may be higher than the respective CDWS, especially under conditions of high accumulation of sediments in the dam. Arsenic, copper and mercury concentrations did not exceed the CDWS under the simulated conditions.
机译：墨西哥哈利斯科州瓜达拉哈拉市有410万居民，供水严重不足。一旦建成，Arcediano大坝将从佛得角和圣地亚哥河中汲取水，经过处理后将为城市供水。进行本研究是为了拟定方案并估计由于沉积物中积累的污染物的释放而污染大坝中收集的水的风险。通过对水和沉积物进行采样，对环境样品进行化学分析以及水与沉积物相互作用的数值模型，可以估算沉积物中金属的解吸。随着河流从El Salto采样站的下游流向将建造Arcediano大坝的地点，水质普遍提高。在所有采样站，铝都超过了墨西哥的饮用水供应标准（MCDWS），而在某些采样站，铁和锰超过了标准。痕量金属低于各自的标准。对于河流中的沉积物样品，铬，铜和锌超过了《加拿大临时沉积物质量指南》（ISQG），而锰和镍超过了可能的影响水平（PEL）。其他金属均低于这些限制。除萨尔托（El Salto）采样站外，金属大多富含铁沉积物，其次是含铝粘土，其次是锰氧化物。因此，金属与氧化铁的相互作用被认为是控制吸附机理。通过模拟估算沉积物中金属的解吸造成的水污染风险表明，锰和镍的浓度可能高于CDWS。在某些情况下，铅和铬的溶解浓度可能高于相应的CDWS，尤其是在大坝中沉积物大量堆积的条件下。在模拟条件下，砷，铜和汞的浓度不超过CDWS。

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