...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Tungsten Speciation and Solubility in Munitions-Impacted Soils
【24h】

Tungsten Speciation and Solubility in Munitions-Impacted Soils

机译：在受弹药影响的土壤中钨的形态和溶解度

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Considerable questions persist regarding tungsten geochemistry in natural systems, including which forms of tungsten are found in soils and how adsorption regulates dissolved tungsten concentrations. In this study, we examine tungsten speciation and solubility in a series of soils at firing ranges in which tungsten rounds were used. The metallic, mineral, and adsorbed forms of tungsten were characterized using X-ray absorption spectroscopy and X-ray microprobe, and desorption isotherms for tungsten in these soils were used to characterize its solid–solution partitioning behavior. Data revealed the complete and rapid oxidation of tungsten metal to hexavalent tungsten(VI) and the prevalence of adsorbed polymeric tungstates in the soils rather than discrete mineral phases. These polymeric complexes were only weakly retained in the soils, and porewaters in equilibrium with contaminated soils had 850 mg L~(–1) tungsten, considerably in excess of predicted solubility. We attribute the high solubility and limited adsorption of tungsten to the formation of polyoxometalates such as W_(12)SiO_(40)~(4–), an α-Keggin cluster, in soil solutions. Although more research is needed to confirm which of such polyoxometalates are present in soils, their formation may not only increase the solubility of tungsten but also facilitate its transport and influence its toxicity.
机译：关于自然系统中钨的地球化学问题仍然存在很多问题，包括在土壤中发现哪种钨形式以及吸附如何调节溶解的钨浓度。在这项研究中，我们研究了使用钨粒的烧成范围内一系列土壤中钨的形态和溶解度。使用X射线吸收光谱法和X射线微探针对钨的金属，矿物和吸附形式进行了表征，并利用这些土壤中钨的解吸等温线表征了其固溶体分配行为。数据显示，钨金属完全而快速地氧化为六价钨（VI），并且土壤中而不是离散的矿物相中普遍存在吸附的聚合钨酸盐。这些聚合物络合物仅保留在土壤中，与污染土壤保持平衡的孔隙水中含有850 mg L〜（-1）钨，大大超过了预期的溶解度。我们将钨的高溶解度和有限的吸附归因于土壤溶液中多金属氧酸盐的形成，例如W_（12）SiO_（40）〜（4 –），α-Keggin团簇。尽管需要更多的研究来确定土壤中存在哪些此类多金属氧酸盐，但它们的形成不仅可以增加钨的溶解度，而且可以促进其运输并影响其毒性。

著录项

  • 来源
    《Environmental Science & Technology》 |2018年第3期|1045-1053|共9页
  • 作者

    Benjamín C. Bostick; Jing Sun; Joshua D. Landis; Jay L. Clausen;

  • 作者单位

    Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, United States;

    School of Earth Sciences, University of Western Australia, 35 Stirling Highway, Perth, West Australia 6009, Australia;

    Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755, United States;

    Research and Development Center, Cold Regions Research and Engineering Laboratory, 72 Lyme Road, Hanover, New Hampshire 03755, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号