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首页> 外文期刊>Environmental Geology >Interrelationship of TOC, As, Fe, Mn, Al and Si in shallow alluvial aquifers in Chapai-Nawabganj, Northwestern Bangladesh:implication for potential source of organic carbon
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Interrelationship of TOC, As, Fe, Mn, Al and Si in shallow alluvial aquifers in Chapai-Nawabganj, Northwestern Bangladesh:implication for potential source of organic carbon

机译：孟加拉国西北部Chapai-Nawabganj浅冲积含水层中TOC，As，Fe，Mn，Al和Si的相互关系：对潜在有机碳源的启示

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摘要

Two boreholes and ten piezometers in the Ganges flood plain were drilled and installed for collecting As-rich sediments and groundwater. Groundwater samples from the Ganges flood plain were collected for the analysis of cations (Ca~(2+), Mg~(2+), K~+, Na~+), anions (Cl~-, NO_3~-, SO_4~(2-)), total organic carbon (TOC), and trace elements (As, Mn, Fe, Sr, Se, Ni, Co, Cu, Mo, Sb, Pb). X-ray powder diffraction was performed to characterize the major mineral contents of aquifer sediments and X-ray fluorescence (XRF) to analyze the major chemical composition of alluvial sediments. Results of XRF analysis clearly show that fine-grained sediments contain higher amounts of trace element because of their high surface area for adsorption. Relative fluorescence index (15-38 QSU) of humic substance in groundwater was measured using spectrofiuo-rometer, the results revealed that groundwater in the Ganges flood plain contains less organic matter (OM). Arsenic concentration in water ranges from 2.8 to 170 μg/L (mean 50 μg/L) in the Ganges flood plain. Arsenic content in sediments ranges from 2.1 to 14 mg/kg (mean 4.58 mg/kg) in the flood plains. TOC ranges from 0.49 to 3.53 g/kg (mean 1.64 g/kg) in the Ganges flood plain. Arsenic is positively correlated with TOC (R~2 = 0.55) in sediments of this plain. Humic substances were extracted from the sediments from the Ganges flood plain. Fourier transform infrared analysis of the sediments revealed that the plain contains less humic substances. The source of organic carbon was assigned from δ~(13)C values obtained using elemental analysis-isotope ratio mass spectrometry (EA-IRMS); the values (-10 to -29.44%o) strongly support the hypothesis that the OM of the Ganges flood plain is of terrestrial origin.
机译：在恒河洪水平原上钻了两个井眼和十个压力计，并安装了这些井以收集富砷沉积物和地下水。收集恒河洪泛平原的地下水样品，用于分析阳离子（Ca〜（2 +），Mg〜（2 +），K〜+，Na〜+），阴离子（Cl〜-，NO_3〜-，SO_4〜 （2-）），总有机碳（TOC）和痕量元素（As，Mn，Fe，Sr，Se，Ni，Co，Cu，Mo，Sb，Pb）。进行了X射线粉末衍射以表征含水层沉积物中的主要矿物质含量，并通过X射线荧光（XRF）分析了冲积沉积物的主要化学组成。 XRF分析的结果清楚地表明，细颗粒沉积物由于其较高的吸附表面积而含有更多的痕量元素。用分光光度计测量了地下水中腐殖质的相对荧光指数（15-38 QSU），结果表明，恒河洪泛平原的地下水中有机质（OM）较少。恒河洪泛平原中水中的砷浓度范围为2.8至170μg/ L（平均50μg/ L）。洪泛区沉积物中的砷含量为2.1至14 mg / kg（平均4.58 mg / kg）。在恒河洪泛平原，TOC范围为0.49至3.53 g / kg（平均1.64 g / kg）。该平原沉积物中砷与总有机碳呈正相关（R〜2 = 0.55）。从恒河洪泛平原的沉积物中提取了腐殖质。沉积物的傅立叶变换红外分析表明，平原中含有的腐殖质较少。从使用元素分析-同位素比质谱法（EA-IRMS）获得的δ〜（13）C值分配有机碳源；值（-10到-29.44％o）强烈支持恒河洪泛平原的OM来自地面的假设。

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  • 来源
    《Environmental Geology》 |2011年第5期|p.955-967|共13页
  • 作者

    A. H. M. Selim Reza; Jiin-Shuh Jean; Ming-Kuo Lee; Shang-De Luo; Jochen Bundschuh; Hong-Chun Li; Huai-Jen Yang; Chia-Chuan Liu;

  • 作者单位

    Department of Earth Sciences, National Cheng Kung University,Tainan 70101, Taiwan;

    Department of Earth Sciences, National Cheng Kung University,Tainan 70101, Taiwan;

    Department of Geology and Geography, Auburn University,Auburn, AL 36849, USA;

    Department of Earth Sciences, National Cheng Kung University,Tainan 70101, Taiwan;

    Department of Geology and Geography, Auburn University,Auburn, AL 36849, USA;

    Department of Earth Sciences, National Cheng Kung University,Tainan 70101, Taiwan;

    Department of Earth Sciences, National Cheng Kung University,Tainan 70101, Taiwan;

    Department of Earth Sciences, National Cheng Kung University,Tainan 70101, Taiwan;

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  • 正文语种 eng
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  • 关键词

    arsenic; organic matter; bangladesh; ganges flood plain; spectrofluorometer;

    机译：砷;有机物;孟加拉国;恒河泛滥平原;分光荧光计;

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