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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Distribution of Selected Heavy Metals in Sediments of the Agueda River (Central Portugal)
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Distribution of Selected Heavy Metals in Sediments of the Agueda River (Central Portugal)

机译：阿格达河沉积物中某些重金属的分布（葡萄牙中部）

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摘要

The state of river water deterioration in the Agueda hydrographic basin, mostly in the western part, partly reflects the high rate of housing and industrial development in this area in recent years. The streams have acted as a sink for organic and inorganic loads from several origins: domestic and industrial sewage and agricultural waste. The contents of the heavy metals Cr, Cd, Ni, Cu, Pb, and Zn were studied by sequential chemical extraction of the principal geochemical phases of streambed sediments, in the < 63 μm fraction, in order to assess their potential availability to the environment, investigating the metal concentrations, assemblages, and trends. The granulometric and mineralogical characteristics of this sediment fraction were also studied. This study revealed clear pollution by Cr, Cd, Ni, Cu, Zn, and Pb, as a result from both natural and anthropogenic origins. The chemical transport of metals appears to be essentially by the following geochemical phases, in decreasing order of significance: (exchangeable + carbonates) > > (organics) > > (Mn and Fe oxides and hydroxides). The (exchangeable + carbonate) phase plays an important part in the fixation of Cu, Ni, Zn, and Cd. The organic phase is important in the fixation of Cr, Pb, and also Cu and Ni. Analyzing the metal contents in the residual fraction, we conclude that Zn and Cd are the most mobile, and Cr and Pb are less mobile than Cu and Ni. The proximity of the pollutant sources and the timing of the influx of contaminated material control the distribution of the contaminant-related sediments locally and on the network scale.
机译：阿格达水文流域的河流水质恶化状况（主要在西部地区）部分反映了近年来该地区住房和工业发展的高速度。这些溪流已成为来自多个来源的有机物和无机物的汇：家庭和工业污水以及农业废物。通过连续化学提取流化沉积物的主要地球化学相（≤63μm分数）来研究重金属Cr，Cd，Ni，Cu，Pb和Zn的含量，以评估其对环境的潜在利用，研究金属的浓度，组合和趋势。还研究了该沉积物级分的粒度和矿物学特征。这项研究表明，天然和人为来源均导致Cr，Cd，Ni，Cu，Zn和Pb的明显污染。金属的化学迁移似乎基本上是通过以下地球化学相，按降序排列：（可交换+碳酸盐）（有机物）（锰和铁的氧化物和氢氧化物）。 （可交换+碳酸盐）相在固定Cu，Ni，Zn和Cd中起着重要的作用。有机相在固定Cr，Pb以及Cu和Ni方面很重要。分析残留部分中的金属含量，我们得出结论，锌和镉的迁移率最高，而铬和铅的迁移率低于铜和镍。污染物源的接近性和被污染物质涌入的时间控制着与污染物有关的沉积物在本地和网络规模上的分布。

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