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首页> 外文期刊>Environmental Science & Technology >Localization and Speciation of Arsenic in Soil and Desert Plant Parkinsonia florida Using μ XRF and μ XANES
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Localization and Speciation of Arsenic in Soil and Desert Plant Parkinsonia florida Using μ XRF and μ XANES

机译：利用μXRF和μXANES在佛罗里达州土壤和荒漠植物帕金森病中砷的定位和形态分析

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摘要

Parkinsonia florida is a plant species native to the semidesert regions of North America. The cultivation characteristics of this shrub/tree suggest that it could be used for phytoremediation purposes in semiarid regions. This work describes, through the use of synchrotron μXRF and μXANES techniques and ICP-OES, the arsenic (As) accumulation and distribution in P. florida plants grown in two soils spiked with As at 20 mg kg~1. Plants grown in a sandy soil accumulated at least twice more As in the roots compared to plants grown in a loamy soil. The lower As accumulation in plants grown in the loamy soil corresponded to a lower concentration of As in the water-soluble fraction (WSF) of this soil. LC-ICP-MS speciation analysis showed only As(V) in the WSF from all treatments. In contrast, linear combination XANES speciation analysis from the root tissues showed As mainly present in the reduced As(lll) form. Moreover, a fraction of the reduced As was found coordinating to S in a form consistent with As—Cys3. The percentage of As coordinated to sulfur was smaller for plants grown in the loamy soil when compared to the sandy soil.
机译：佛罗里达帕金森州是一种植物物种，原产于北美半沙漠地区。这种灌木/乔木的栽培特性表明它可以用于半干旱地区的植物修复。这项工作通过使用同步加速器μXRF和μXANES技术以及ICP-OES，描述了在两种掺有20 mg kg〜1 As的土壤中生长的佛罗里达体育植物中砷（As）的积累和分布。与在壤土中生长的植物相比，在沙土中生长的植物在根部积累的砷至少高出两倍。在壤土中生长的植物中较低的As积累对应于该土壤的水溶性部分（WSF）中较低的As浓度。 LC-ICP-MS形态分析表明，所有处理中WSF中仅As（V）。相反，来自根组织的线性组合XANES形态分析表明，As主要以还原的As（III）形式存在。此外，发现一部分还原的As以与As-Cys3一致的形式与S配位。与沙质土壤相比，对于在壤土中生长的植物来说，As对硫的百分比较小。

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  • 来源
    《Environmental Science & Technology》 |2011年第18期|p.7848-7854|共7页
  • 作者

    Hiram Castillo-Michel; Jose Hernandez-Viezcas; Kenneth M. Dokken; Matthew A. Marcus; Jose R. Peralta-Videa; Jorge L. Gardea-Torresdey;

  • 作者单位

    Environmental Sciences and Engineering Ph.D. Program, The University of Texas at El Paso, 500 West University Avenue,El Paso, Texas 79968, United States;

    Chemistry Department, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States;

    Chemistry Department, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States;

    Advanced Light Source, Beamline 10.3.2, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States;

    Chemistry Department, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States;

    Chemistry Department, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States Environmental Sciences and Engineering Ph.D. Program, The University of Texas at El Paso, 500 West University Avenue,El Paso, Texas 79968, United States;

  • 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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