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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Distribution and mobility of geogenic molybdenum and arsenic in a limestone aquifer matrix
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Distribution and mobility of geogenic molybdenum and arsenic in a limestone aquifer matrix

机译：石灰石含水层基质中成因钼和砷的分布和迁移率

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摘要

To investigate the potential of Mo and As as possible geogenic contaminants, three sediment cores were examined to evaluate their mineralogical association, distribution and mobility. The cores were described and analyzed for total organic carbon (TOC), Ca, Mg, Si, Al, P, Sr, As, Mo, Fe, and S content. Except in the uppermost segment, limestone was the main lithology with the occasional presence of dolomite and clay. That change in lithology was also observed in the bulk chemical composition, where Ca, Mg and Sr concentrations increased with depth, while Si, Al and P concentrations decreased with depth. Minor minerals included pyrite (FeS2), powellite (CaMoO4) and ferrihydrite. The minimum, maximum, median and standard deviations for all analyzed elements, including As and Mo were comparable for all three cores. Molybdenum and As, however, varied significantly with depth and median As and Mo values were above their respective crustal averages of approximately 1.1 mg/kg and 1.5 mg/kg. The median values for As were 1.9 mg/kg in core DEP-1, 3.3 mg/kg in DEP-2 and 1 mg/kg in DEP-5. The median values for Mo were 2.3 mg/kg in core DEP-1, 2.5 mg/kg in DEP-2 and 2.5 mg/kg in DEP-5. Maximum concentrations for As were 101.9 mg/kg, 47.5 mg/kg and 56.2 mg/kg in cores DEP-1, DEP-2 and DEP-5, respectively. Maximum concentrations for Mo were 880 mg/kg, 123 mg/kg and 225 mg/kg in cores DEP-1, DEP-2 and DEP-5, respectively. Electron microprobe analyses of individual minerals revealed variable concentrations of As ranging from approximately 300 to 9000 mg/kg, in pyrite and up to 17,600 mg/kg in powellite (CaMoO4). The Mo concentration in pyrite was consistently below the detection limit of approximately 100 mg/kg. In powellite the Mo concentration was up to 42 wt%.
机译：为了研究钼和砷作为可能的地质污染物的潜力，对三个沉积物岩心进行了评估，以评估它们的矿物学联系，分布和迁移率。描述并分析了岩心的总有机碳（TOC），Ca，Mg，Si，Al，P，Sr，As，Mo，Fe和S含量。除了最上段以外，石灰岩是主要的岩性，偶有白云石和粘土。在整体化学组成中也观察到了岩性的变化，其中Ca，Mg和Sr的浓度随深度增加，而Si，Al和P的浓度随深度减少。次要矿物包括黄铁矿（FeS2），鲍威尔石（CaMoO4）和水铁矿。所有分析元素（包括砷和钼）的最小，最大，中值和标准偏差在所有三个岩心中都是可比的。但是，钼和砷随深度变化很大，中位砷和钼值高于各自的地壳平均水平，分别约为1.1 mg / kg和1.5 mg / kg。核心DEP-1中As的中位数值为1.9 mg / kg，DEP-2中为3.3 mg / kg，DEP-5中为1 mg / kg。在核心DEP-1中，Mo的中位数为2.3 mg / kg，在DEP-2中为2.5 mg / kg，在DEP-5中为2.5 mg / kg。芯DEP-1，DEP-2和DEP-5中As的最大浓度分别为101.9 mg / kg，47.5 mg / kg和56.2 mg / kg。在芯DEP-1，DEP-2和DEP-5中，Mo的最大浓度分别为880 mg / kg，123 mg / kg和225 mg / kg。对单个矿物质的电子微探针分析显示，黄铁矿中As的浓度变化范围大约为300至9000 mg / kg，而鲍威尔石（CaMoO4）中As的浓度最高为17,600 mg / kg。黄铁矿中的Mo浓度始终低于约100 mg / kg的检出限。在Powellite中，Mo浓度高达42 wt％。

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