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首页> 外文期刊>Environmental Science & Technology >Hybrid Flow System for Automatic Dynamic Fractionation and Speciation of Inorganic Arsenic in Environmental Solids
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Hybrid Flow System for Automatic Dynamic Fractionation and Speciation of Inorganic Arsenic in Environmental Solids

机译：用于环境固体中无机砷自动动态分馏和形成的混合流动系统

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摘要

An integrated flow analysis system and protocol are proposed for the first time for automatic dynamic flow-through fractionation of inorganic arsenic (arsenite and arsenate) in environmental solids in combination with its real-time speciation. Four extractants (i.e., (1) 0.05 M ammonium sulfate, (2) 0.05 M ammonium dihydrogen phosphate, (3) 0.2 M ammonium oxalate, and (4) a mixture of 0.2 M ammonium oxalate and 0.1 M ascorbic acid at 96 ℃) are applied sequentially to the sample to measure bioaccessible inorganic arsenic associated with (1) nonspecifically sorbed phases, (2) specifically sorbed phases, (3) amorphous plus poorly crystalline hydrous oxides of iron and aluminum, and (4) well-crystallized hydrous oxides of Fe and Al, respectively. The kinetic extraction profiles of arsenite and total inorganic arsenic are obtained for each extractant by automatic collection of a given number of its aliquots (subfractions) exposed to the solid sample. Arsenite and total inorganic arsenic in each subtraction are converted to arsine sequentially by hydride generation at pH 4.50 and in 1.14 M hydrochloric acid, respectively. Arsine is absorbed into a potassium permanganate solution, the discoloration of which is related to the concentration of the corresponding arsenic species. The proposed method is successfully validated by analyzing a soil reference material (NIST 2710a) and a sediment sample.
机译：首次提出了一种集成的流动分析系统和协议，结合其实时形态，可自动动态地分馏环境固体中的无机砷（亚砷酸盐和砷酸盐）。四种萃取剂（即（1）0.05 M硫酸铵，（2）0.05 M磷酸二氢铵，（3）0.2 M草酸铵和（4）0.2 M草酸铵和0.1 M抗坏血酸在96℃下的混合物）依次施加到样品上以测量与（1）非特异性吸附相，（2）特别吸附相，（3）铁和铝的无定形加结晶性差的含水氧化物以及（4）结晶良好的含水氧化物相关的可生物利用的无机砷铁和铝分别。通过自动收集暴露于固体样品中的给定数量的等分试样（亚组分），获得每种萃取剂的砷和总无机砷的动力学萃取曲线。每次减法中的砷和总无机砷分别通过在pH 4.50和1.14 M盐酸中生成氢化物依次转化为a。砷被吸收到高锰酸钾溶液中，其变色与相应砷的浓度有关。通过分析土壤参考物质（NIST 2710a）和沉积物样品，成功地验证了所提出的方法。

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  • 来源
    《Environmental Science & Technology》 |2015年第5期|2733-2740|共8页
  • 作者

    Yanlin Zhang; Manuel Miro; Spas D. Kolev;

  • 作者单位

    Centre for Aquatic Pollution Identification and Management (CAPIM), School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia;

    FI-TRACE group, Department of Chemistry, Faculty of Science, University of Balearic Islands, 07122 Palma de Mallorca, Spain;

    Centre for Aquatic Pollution Identification and Management (CAPIM), School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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