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首页> 外文期刊>Journal of Analytical Atomic Spectrometry >Development and application of a HPIC-ICP-MS method for the redox arsenic speciation in river sediment pore waters
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Development and application of a HPIC-ICP-MS method for the redox arsenic speciation in river sediment pore waters

机译：HPIC-ICP-MS方法在河流沉积物孔隙水中氧化还原砷形态的开发与应用

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摘要

A new sensitive chromatographic method has been developed for As speciation determination in anoxic pore waters. Starting from aliquots of 25 μL, the different As species As(ⅲ), As(ⅴ), MMAA~ⅴ and DMAA~ⅴ were separated in less than 4 min by HPIC-ICP-MS using the lonPac® AG7-AS7 anion-exchange column set and dilute HNO_3 as mobile phase. The detection limits were below or equal to 0.25 μg L~(-1) for each As species, which makes the method efficient to determine As speciation in poorly-contaminated sediments. In addition, no precipitation of iron and manganese (hydr)-oxides was observed since the anoxic samples were systematically carefully manipulated under nitrogen atmosphere. Chlorides were eliminated by the chromatographic separation, thus making possible speciation analysis in estuarine or seawater samples. The use of internal standard was not necessary due to good signal stability (＜10%) at m/z 75 over 4 h of analysis. An environmental application has also been successfully performed in the Marque River (Northern France). Inorganic As species were detected in pore waters at low concentrations [below 1 and 10 μg L~(-1), for As(ⅴ) and As(ⅲ) respectively]. Others As species, identified as thioarsenic species, were also detected.
机译：已经开发出一种新的灵敏色谱方法，用于测定缺氧孔隙水中的砷形态。从25μL等分试样开始，使用lonPac®AG7-AS7阴离子-通过HPIC-ICP-MS在不到4分钟的时间内分离出不同的As物种As（ⅲ），As（ⅴ），MMAA〜ⅴ和DMAA〜ⅴ。交换色谱柱集并稀释HNO_3作为流动相。每种砷物种的检出限均低于或等于0.25μgL〜（-1），这使得该方法可以有效地确定污染较严重沉积物中的砷形态。此外，由于在氮气氛下对缺氧样品进行了系统的仔细操作，因此未观察到铁和锰（氢）氧化物的沉淀。通过色谱分离可以消除氯化物，从而可以在河口或海水样品中进行形态分析。由于在4 h的分析中m / z 75时具有良好的信号稳定性（＜10％），因此不必使用内标。马克河（法国北部）也已成功进行了环保应用。在孔隙水中以低浓度检测到无机砷物种[分别低于1和10μgL〜（-1），分别为As（ⅴ）和As（ⅲ）。还检出了其他被鉴定为硫代砷的As物种。

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  • 来源
    《Journal of Analytical Atomic Spectrometry》 |2015年第7期|1562-1570|共9页
  • 作者

    Josselin Gorny; David Dumoulin; Ludovic Lesven; Catherine Noiriel; Benoit Made; Gabriel Billon;

  • 作者单位

    LAboratoire de Spectrochimie Infrarouge et Raman (LASIR), UMR 8516 CNRS-University Lille 1, Villeneuve d'Ascq, France;

    LAboratoire de Spectrochimie Infrarouge et Raman (LASIR), UMR 8516 CNRS-University Lille 1, Villeneuve d'Ascq, France;

    LAboratoire de Spectrochimie Infrarouge et Raman (LASIR), UMR 8516 CNRS-University Lille 1, Villeneuve d'Ascq, France;

    Geosciences Environnement Toulouse, Observatoire Midi Pyrenees, Universite de Toulouse, CNRS, IRD, Toulouse, France;

    French National Radioactive Waste Management Agency (ANDRA), Research and Development Division (DRD), Chatenay-Malabry, France;

    LAboratoire de Spectrochimie Infrarouge et Raman (LASIR), UMR 8516 CNRS-University Lille 1, Villeneuve d'Ascq, France;

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