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Fractionation of Selenium during Selenate Reduction by Granular Zerovalent Iron

机译：零价铁颗粒还原硒的过程中硒的分馏

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摘要

Batch experiments were conducted using granular zerovalent iron (G-ZⅥ) with either ultrapure water or CaCO_3 saturated simulated groundwater to assess the extent of Se isotope fractionation in solution under the anaerobic conditions characteristic of many aquifers. G-ZⅥ is a common remediation material in permeable reactive barriers (PRB) to treat Se-contaminated groundwater, and stable isotopes are a potential tool for assessing removal mechanisms- The solution composition, speciation of Se, and Se isotope ratios were determined during both sets of experiments. Dissolved Se concentrations decreased from 10 to ＜2 mg L~(-1) after 3 d in the CaCO_3 system and below 0.4 mg L~(-1) after 2 d in the ultrapure water system. XANES analysis of the solid phase showed spectra consistent with the formation of Se(Ⅳ), Fe_2(SeO_3)_3, FeSe, FeSe_2, and Se(0) on the G-ZⅥ. Selenium isotope ratio measurements in solution in the CaCO_3 and ultrapure water experiments showed enrichment of δ~(82/76)Se values from -0.94 ± 0.07‰ and -1.93 ± 0.20‰ to maximum values of 6.85 ± 0.52‰ and 5.68 ± 0.20‰ over 72 and 36 h, respectively. The effective fractionations associated with the reduction of Se(Ⅵ) were 4.3‰ within the CaCO_3 saturated water and 3.0‰ in ultrapure water.
机译：使用粒状零价铁（G-ZⅥ）与超纯水或CaCO_3饱和模拟地下水进行批处理实验，以评估许多含水层在厌氧条件下溶液中硒同位素分馏的程度。 G-ZⅥ是可渗透反应性屏障（PRB）中常见的修复材料，用于处理被Se污染的地下水，稳定的同位素是评估去除机理的潜在工具-在两次测定过程中都确定了溶液的组成，Se的形态和Se同位素比套实验。在CaCO_3系统中，溶解硒的浓度在3 d后从10降低至＜2 mg L〜（-1），而在超纯水系统中2 d后的溶解硒浓度则降至0.4 mg L〜（-1）以下。固相的XANES分析显示光谱与在G-ZⅥ上形成Se（Ⅳ），Fe_2（SeO_3）_3，FeSe，FeSe_2和Se（0）一致。在CaCO_3和超纯水实验中溶液中硒同位素比的测量表明δ〜（82/76）Se值从-0.94±0.07‰和-1.93±0.20‰富集到6.85±0.52‰和5.68±0.20‰的最大值分别超过72小时和36小时。与还原硒相关的有效馏分在CaCO_3饱和水中为4.3‰，在超纯水中为3.0‰。

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  • 来源
    《Environmental Science & Technology》 |2015年第19期|11688-11696|共9页
  • 作者

    Heather K. Shrimpton; David W. Blowes; Carol J. Ptacek;

  • 作者单位

    Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada;

  • 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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