Trace metals speciation in sediments of the Basento River (Italy)
Trace metals speciation in sediments of the Basento River (Italy)
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DOI：
10.1016/j.clay.2010.10.029
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发表时间：
2011-09-01
影响因子：
5.6
通讯作者：
Fiore, Saverio
中科院分区：
文献类型：
--
作者：
Medici, Luca;Bellanova, Jessica;Fiore, Saverio
对意大利巴森托河沿岸水系沉积物中部分金属(镉、钴、铬、铜、镍、铅、铊、钒和锌)的丰度和分布进行了研究。在四个不同的季节，在70个站点收集了280个样本。为了更好地了解这些污染物的危害性，进行了顺序提取程序以确定金属的化学形态，强调了所研究地点的人为压力。采用污染因子(Cf)、污染程度(C-d)、富集度指数(EL)、单项污染因子(ICF)和全球污染因子(GCF)等不同的参数来描述流域中这些金属的污染程度。通过风险评估方法，计算出夏季河流系统处于中等潜在的生态风险，其他三个季节的污染程度相对较低。铅和锌是与系统污染有关的最令人担忧的金属，首先以氧化相的形式存在。氧化相形式的金属量似乎对钴和铬等金属也非常重要。在Potenza镇(工业区)附近的不同站点中，不同的金属以临界浓度出现。Tl和V的人为压力似乎低于其他金属。粘土矿物与钴、铬、镍含量的关系突出了粘土矿物对有机质与这些元素络合的重要性。(C)2010爱思唯尔B.V.保留所有权利。
The abundance and distribution of selected metals (cadmium, cobalt, chromium, copper, nickel, lead, thallium, vanadium, and zinc) in the stream sediments were studied along the Basento River (Italy). Two hundred eighty samples were collected in seventy stations during four different seasons. Sequential extraction procedures were carried out to define the chemical forms of the metals, in order to better understand the hazardousness of these pollutants, emphasizing the anthropogenic pressure of the sites studied. Different parameters were used to describe the contamination of these metals in the river basin: the Contamination Factor (CF), the Degree of Contamination (C-d), the Enrichment Index (El), the Individual Contamination Factor (ICF), and the Global Contamination Factor (GCF).By means of a risk assessment methodology, it was calculated that during summer the river system was exposed to a moderate potential ecological risk and that the other three seasons highlighted relatively lower degrees of contamination. Pb and Zn were the metals of most concern with respect to the system pollution, first of all in the form of oxide phases. The metal amounts in the form of oxide phases appeared to be very important also for metals such as Co and Cr. Different metals occurred in critical concentrations in various stations near Potenza town (Industrial Area). The anthropogenic pressure of Tl and V seemed to be lower than for the other metals. The relations between clay minerals and Co, Cr, Ni amounts highlighted the importance of clay minerals for favouring the complexation of these elements by organic matter. (C) 2010 Elsevier B.V. All rights reserved.