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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Application of the BCR sequential extraction scheme to dredged pond sediments contaminated by Pb-Zn mining:A combined geochemical and mineralogical approach
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Application of the BCR sequential extraction scheme to dredged pond sediments contaminated by Pb-Zn mining:A combined geochemical and mineralogical approach

机译：BCR顺序提取方案在铅锌矿开采污染的疏pond池塘沉积物中的应用：地球化学和矿物学相结合的方法

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The modified BCR sequential extraction procedure [Rauret,G.,Lopez-Sanchez,J.,Sauquillo,A.,Rubio,R.,Davidson,C,Ure,A.,Quevauviller,Ph.,1999.Improvement of the BCR three step sequential extraction procedure prior to certification of new soil and sediment reference materials.J.Environ.Monit.1,57-60.] was applied to 4 sediments from a mine tailing pond in La Calamine (East-Belgium).The results showed a very different behaviour of different samples towards the same extraction scheme.In samples with an elevated acid neutralizing capacity,a significant increase in the pH of the extracts was measured after the first two extraction steps.Other artefacts,such as readsorption of metals and precipitation could be deduced by comparing X-ray diffraction patterns after different extraction steps.For example,anglesite was effectively dissolved during the acid extraction step (step 1) but relatively low Pb concentrations were measured in the CH3COOH extract because of the readsorption of Pb.Mineralogical analysis of the sediments after each extraction step also indicated the incomplete oxidation of sulphides by H2O2.Besides a mineralogical analysis,the monitoring of the pH of the extracts and the analysis of major elements (Fe,Ca,Al,Mrf) can be helpful for the interpretation of the results of the sequential extraction.The combination of sequential extractions with mineralogical sample investigation provided information on the reactivity and solubility of minerals in the samples.This improved the interpretation,at least within the detection limits of the mineralogical analysis applied.Besides the improved interpretation of the results of the sequential extractions for sediments in which minerals are identified,the information concerning the reactivity of minerals is an important tool to evaluate the risk associated with contaminated sediments.
机译：修改后的BCR顺序提取程序[Rauret，G.，Lopez-Sanchez，J.，Sauquillo，A.，Rubio，R.，Davidson，C，Ure，A.，Quevauviller，Ph。，1999.BCR的改进三在对新的土壤和沉积物参考材料进行认证之前，分步进行了顺序提取程序。[J.Environ.Monit.1,57-60。]被用于从La Calamine（比利时东部）的一个矿山尾矿池中提取的4种沉积物。结果表明在相同的萃取方案下，不同样品的行为有很大不同。在酸中和能力增强的样品中，在前两个萃取步骤后，萃取物的pH值显着增加。其他。象，例如金属的重吸收和沉淀可以通过比较不同萃取步骤后的X射线衍射图来推断。例如，在酸萃取步骤（步骤1）中有效地溶解了角铁，但由于Pb的再吸收，CH3COOH萃取物中测得的Pb浓度相对较低。对每个萃取步骤后的沉积物进行的分析还表明，H2O2会硫化物不完全氧化。除了进行矿物学分析之外，监测萃取液的pH值和分析主要元素（Fe，Ca，Al，Mrf）也可能会有所帮助顺序萃取与矿物学样品研究的结合提供了有关矿物在样品中的反应性和溶解度的信息。这至少在所应用矿物学分析的检测范围内改善了解释。除了可以更好地解释已识别出矿物质的沉积物的顺序提取结果外，有关矿物质反应性的信息也是评估与受污染的沉积物相关的风险的重要工具。

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