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首页> 外文期刊>The Science of the Total Environment >Mechanisms controlling lateral and vertical porewater migration of depleted uranium (DU) at two UK weapons testing sites
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Mechanisms controlling lateral and vertical porewater migration of depleted uranium (DU) at two UK weapons testing sites

机译：在两个英国武器试验场控制贫铀（DU）的横向和垂直孔隙水迁移的机制

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摘要

Uranium associations with colloidal and truly dissolved soil porewater components from two Ministry of Defence Firing Ranges in the UK were investigated. Porewater samples from 2-cm depth intervals for three soil cores from each of the Dundrennan and Eskmeals ranges were fractionated using centrifugal ultrafiltration (UF) and gel electrophoresis (GE). Soil porewaters from a transect running downslope from the Dundrennan firing area towards a stream (Dunrod Burn) were examined similarly. Uranium concentrations and isotopic composition were determined using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Multi-Collector-Inductively Coupled Plasma-Mass Spectrometry (MC-ICP-MS), respectively. The soils at Dundrennan were Fe- and Al-rich clay-loam soils whilst at Eskmeals, they were Fe- and Al-poor sandy soils; both, however, had similar organic matter contents due to the presence of a near-surface peaty layer at Eskmeals. These compositional features influenced the porewater composition and indeed the associations of U (and DU). In general, at Dundrennan, U was split between large (100 kDa-02 urn) and small (3-30 kDa) organic colloids whilst at Eskmeals, U was mainly in the small colloidal and truly dissolved fractions. Especially below 10 cm depth, association with large Fe/Al/organic colloids was considered to be a precursor to the removal of U from the Dundrennan porewaters to the solid phase. In contrast, the association of U with small organic colloids was largely responsible for inhibiting attenuation in the Eskmeals soils. Lateral migration of U (and DU) through near-surface Dundrennan soils will involve both large and small colloids but, at depth, transport of the smaller amounts of U remaining in the porewaters may involve large colloids only. For one of the Dundrennan cores the importance of redox-related processes for the re-mobilisation of DU was also indicated as Mn~(IV)reduction resulted in the release of both Mn" and Uw into the truly dissolved phase.
机译：研究了来自英国两个国防部射击场的胶体和真正溶解的土壤孔隙水成分中的铀协会。使用离心超滤（UF）和凝胶电泳（GE）分离来自Dundrennan和Eskmeals范围内每个土壤核心的2 cm深度间隔的孔隙水样品。相似地，检查了从Dundrennan烧成区到溪流（Dunrod Burn）的样带下坡的土壤孔隙水。分别使用电感耦合等离子体质谱仪（ICP-MS）和多收集器电感耦合等离子体质谱仪（MC-ICP-MS）测定铀浓度和同位素组成。 Dundrennan的土壤是富含铁和铝的粘土壤土，而Eskmeals的土壤则是贫铁和铝的沙土。然而，由于在Eskmeals上存在近地表层的豌豆层，两者的有机物含量相似。这些组成特征影响了孔隙水的组成，甚至影响了U（和DU）的缔合。通常，在Dundrennan，U被分为大（100 kDa-02 ur）和小的（3-30 kDa）有机胶体，而在Eskmeals中，U主要在小胶体中真正溶解。尤其是在10 cm以下的深度，与大的Fe / Al /有机胶体缔合被认为是从Dundrennan孔隙水中去除U到固相的先驱。相反，U与小的有机胶体的结合在很大程度上抑制了Eskmeals土壤中的衰减。 U（和DU）通过近地邓当南土壤的侧向迁移将涉及大和小的胶体，但在深度上，孔隙水中残留的少量U的迁移可能仅涉及大胶体。对于Dundrennan核心之一，还表明了氧化还原相关过程对DU的重新迁移的重要性，因为Mn〜（IV）还原导致Mn“和Uw均释放到真正溶解的相中。

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  • 来源
    《The Science of the Total Environment》 |2011年第10期|p.1854-1866|共13页
  • 作者

    Margaret C. Graham; Ian W. Oliver; Angus B. MacKenzie; Robert M. Ellam; John G. Farmer;

  • 作者单位

    School of GeoSciences, Crew Building. University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh, EH9 3]N, United Kingdom;

    Scottish Universities Environmental Research Centre (SUERC), Rankine Avenue. Scottish Enterprise Technology Park, East Kilbride, C75 OQF. United Kingdom;

    Scottish Universities Environmental Research Centre (SUERC), Rankine Avenue. Scottish Enterprise Technology Park, East Kilbride, C75 OQF. United Kingdom;

    Scottish Universities Environmental Research Centre (SUERC), Rankine Avenue. Scottish Enterprise Technology Park, East Kilbride, C75 OQF. United Kingdom;

    School of GeoSciences, Crew Building. University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh, EH9 3]N, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    aquatic colloids; ultrafiltration; gel electrophoresis; depleted uranium; isotopes; soil contamination;

    机译：水生胶体;超滤凝胶电泳贫铀;同位素土壤污染;

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