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Corrosion and transport of depleted uranium in sand-rich environments

机译：贫沙环境中贫化铀的腐蚀和运输

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摘要

The firing of depleted uranium (DU) weapons during conflicts and military testing has resulted in the deposition of DU in a variety of sand-rich environments. In this study, DU-amended dune sand microcosm and column experiments were carried out to investigate the corrosion of DU and the transport of corrosion products. Under field-moist conditions, DU corroded to metaschoepite ((UO_2)_8O_2(OH)_(12)(H_2O)_(10) at a rate of 0.10 + 0.012 g cm~(-2)y~(-1). This loosely bound corrosion product detached easily from the coupon and became distributed heterogeneously within the sand. The corrosion of DU caused significant changes in the geochemical environment, with NO_3~- and Fe(III) reduction observed. Column experiments showed that transport of metaschoepite was mainly dependent on its dissolution and the subsequent interaction of the resulting dissolved uranyl (UO_2~(2+)) species with sand particles. The modelling results predict that the transport of U released from metaschoepite dissolution is retarded, due to a slowly desorbing surface species (first order desorption rate constant = 5.0 (±1.0) × 10~(-8) s~(-1)). The concentrations of U eluting from the metaschoepite column were orders of magnitude higher than the World Health Organisation's recommended maximum admissible concentration for U in drinking water of 15 μg L~(-1). Therefore, a relatively high level of mobile U contamination would be expected in the immediate proximity of a corroding penetrator in a sand-rich environment.
机译：在冲突和军事测试期间发射贫化铀（DU）武器导致DU沉积在各种富含沙子的环境中。在这项研究中，进行了DU修正的沙丘微观世界和柱实验，以研究DU的腐蚀和腐蚀产物的传输。在田间潮湿的条件下，DU以0.10 + 0.012 g cm〜（-2）y〜（-1）的速率腐蚀为亚闪辉石（（UO_2）_8O_2（OH）_（12）（H_2O）_（10）。这种松散结合的腐蚀产物很容易从试件上脱离，并在砂中不均匀地分布，DU的腐蚀导致地球化学环境发生了显着变化，观察到NO_3〜-和Fe（III）的还原。模拟结果主要取决于它的溶解以及随后溶解的铀酰（UO_2〜（2+））物种与沙粒的相互作用，模拟结果表明，由于缓速解吸的表面物种，使从次方沸石溶解释放的U的传输受到阻碍。 （一阶解吸速率常数= 5.0（±1.0）×10〜（-8）s〜（-1））。从次球沸石柱上洗脱的U浓度比世界卫生组织建议的最大容许浓度高几个数量级。为你喝酒水为15μgL〜（-1）。因此，在富含沙子的环境中，在腐蚀的渗透器的紧邻范围内，预计会有较高水平的活动性U污染。

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  • 来源
    《Chemosphere》 |2009年第10期|1434-1439|共6页
  • 作者

    Stephanie Handley-Sidhu; Nick D. Bryan; Paul J. Worsfold; David J. Vaughan; Francis R. Livens; Miranda J. Keith-Roach;

  • 作者单位

    Biogeochemistry and Environmental Analytical Chemistry Research Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK;

    Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK Centre for Radiochemistry Research, School of Chemistry, University of Manchester, Manchester M13 9PL, UK;

    Biogeochemistry and Environmental Analytical Chemistry Research Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK;

    Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK;

    Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK Centre for Radiochemistry Research, School of Chemistry, University of Manchester, Manchester M13 9PL, UK;

    Biogeochemistry and Environmental Analytical Chemistry Research Group, School of Earth, Ocean and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    depleted uranium (DU); transport; corrosion; metaschoepite; uranyl;

    机译：贫铀（DU）;运输;腐蚀;变硬岩铀酰;

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