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首页> 外文学位 >Use of tartaric acid and isopropyl alcohol in the reduction of hexavalent chromium and application to chromium contaminated soils and chromite ore processing residue.
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Use of tartaric acid and isopropyl alcohol in the reduction of hexavalent chromium and application to chromium contaminated soils and chromite ore processing residue.

机译：使用酒石酸和异丙醇还原六价铬，并将其应用于受铬污染的土壤和铬铁矿矿石加工残留物中。

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摘要

Although chromium (Cr) is a naturally occurring metal, in the oxidation state +(VI), it is a health concern when present in soils and natural waters due to its solubility and toxicity. Tartaric acid and isopropyl alcohol were evaluated for reduction of Cr(VI) at environmentally relevant pH values, in the presence of soils, and from chromite ore processing residue (COPR). Soil samples were taken from profiles located in delineations of five soil mapping units in Maryland, USA: Christiana-Russett Complex, Askecksy, Annapolis, Jackland, and Ingleside. In solution, the rate of reduction of Cr(VI) by the tartaric acid-Cr-isopropyl alcohol complex was lowered from 0.128 to 0.011 h -1 as pH was raised from 3.0 to 5.0; however, in the presence of the Russett and Jackland soils, the rates of reduction were 0.037 and 0.020 h -1, respectively despite pH values of 5.3 and 5.0. In addition to Cr(VI) reduction, 97.6 and 89.9 microM Mn(II), and 427 and 67.6 microM Fe(II) were solubilized from the Russett and Jackland soils, respectively. Adding soluble Mn2+ and Fe3+ to the five soils with tartaric acid and isopropyl alcohol enhanced reduction of Cr(VI) in all soils, with the addition of Mn2+ enhancing reduction by an additional 0.27 mM Cr(VI) in the Jackland soil and to 1.46 mM in the Downer soil. Furthermore, the addition of tartaric acid and isopropyl alcohol to Mn-oxide coated sand (1.8x10-1 micromol Mn/mg) showed reductive dissolution of Mn(III,/IV)(hydr)oxides, and the resulting Mn(II) enhanced reduction to 1.24 mM (62%) of Cr(VI). When applied to COPR, tartaric acid-Cr-isopropyl alcohol or tartaric acid-Cr-Mn complexes reduced 0.3 mM (30%) Cr(VI), although when COPR was mixed with the Atsion, Collington, or Russett soils, pH values remained below 5.0 and 0.84 mM (84%) of the Cr(VI) was reduced. This work showed that a tartaric acid and isopropyl alcohol solution reductively dissolves Mn(III,/IV)(hydr)oxides from soils, and the resulting Mn(II) enhances reduction of Cr(VI), which can be potentially applied to the reduction of COPR-derived Cr(VI) in a soil remediation strategy.
机译：尽管铬（Cr）是天然存在的金属，但处于氧化态+（VI），但由于其溶解性和毒性，当存在于土壤和天然水中时，对健康的影响很大。评价了酒石酸和异丙醇在环境相关的pH值下在土壤存在下以及铬铁矿矿石加工残留物（COPR）中Cr（VI）的还原。土壤样本取自位于美国马里兰州的五个土壤测绘单位的轮廓上的剖面：克里斯蒂安娜·鲁塞特情结，阿斯克克斯，安纳波利斯，杰克兰和英格尔赛德。在溶液中，酒石酸-Cr-异丙醇络合物对Cr（VI）的还原速率从0.128降至0.011 h -1，pH值从3.0升高至5.0。然而，在Russett和Jackland土壤中，尽管pH值为5.3和5.0，还原速度分别为0.037和0.020 h -1。除了还原Cr（VI）之外，还分别从Russett和Jackland土壤中溶解了97.6和89.9 microM Mn（II）以及427和67.6 microM Fe（II）。用酒石酸和异丙醇向五种土壤中添加可溶性Mn2 +和Fe3 +可以增强所有土壤中Cr（VI）的还原，而添加Mn2 +可以使Jackland土壤中的Cr（VI）额外降低0.27 mM，并达到1.46 mM。在唐纳土壤中。此外，将酒石酸和异丙醇添加到氧化锰包覆的砂中（1.8x10-1微摩尔Mn / mg）显示出Mn（III，/ IV）（氢）氧化物的还原溶解，所得Mn（II）增强了。还原为1.24 mM（62％）的Cr（VI）。当将COPR与Atsion，Collington或Russett土壤混合时，酒石酸-Cr-异丙醇或酒石酸-Cr-Mn络合物应用于COPR时可减少0.3 mM（30％）Cr（VI）。低于5.0和0.84 mM（84％）的Cr（VI）减少了。这项工作表明，酒石酸和异丙醇溶液可还原性地溶解土壤中的Mn（III，/ IV）（氢）氧化物，并且所生成的Mn（II）增强Cr（VI）的还原，可潜在地用于还原土壤修复策略中COPR衍生的Cr（VI）的测定。

著录项

  • 作者

    Brose, Dominic A.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Agriculture Soil Science.;Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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