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首页> 外文学位 >Geochemical and isotopic characterization of lead in fugitive dust from unsurfaced roads in Missouri.
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Geochemical and isotopic characterization of lead in fugitive dust from unsurfaced roads in Missouri.

机译：密苏里州未表面道路上的扬尘中铅的地球化学和同位素特征。

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摘要

Eighteen unsurfaced roadways in Missouri's rural Ozark region were sampled to characterize the differences in trace element and isotopic chemistry to determine if there is a human health concern with inhaling and/or ingestion of fugitive dust generated by a moving vehicle. Road reaches were selected to represent those in similar rural areas with and without the presence of mining activity--13 roads were selected in the Viburnum Trend (VT) resource mining area and five were located to the southwest of the mining areas. Samples were collected using a novel cyclonic fugitive dust sampler (patent pending) that collects a composite sample from a specific reach length of road surface directly from suspension. Preliminary results show that road dusts collected from the VT area have substantially larger concentrations of contaminant trace elements relative to those roads in non-mining areas with Pb being the predominant trace metal. Sequential extraction analysis of samples shows that Pb in the VT dusts is most often associated with the exchangeable + carbonate and reducible phases whereas road dusts outside the mining area had a larger proportion of the total concentration associated with the less mobile oxidizable and residual geochemical phases. In vitro simulated body fluid extractions revealed that as much as 78% and 100% of the total Pb concentration in mining road dusts is extracted by gastric and artificial lung fluids, respectively. Isotopic ratios of Pb from the individual sequential extracts for all dust samples show minimal difference indicating mixing among the operational phases; however, three component end-member mixing was useful in apportioning the total labile Pb among smelter deposition and/or fugitive road haulage, natural bedrock soils, and US aerosols.
机译：对密苏里州奥索卡克乡村地区的18条未露面的道路进行了采样，以表征痕量元素和同位素化学的差异，以确定是否存在吸入和/或摄入移动车辆所产生的扬尘的人类健康隐患。选择路段以代表有采矿活动和不进行采矿活动的类似农村地区的路段-在荚莲趋势（VT）资源采矿区选择了-13条公路，其中有5条位于采矿区西南。使用新型气旋逃逸粉尘采样器（正在申请专利）收集样品，该粉尘收集器直接从悬浮液中从特定的路面到达长度收集复合样品。初步结果表明，与非采矿区的道路相比，从VT区收集的道路灰尘中污染物痕量元素的浓度要高得多，其中Pb是主要的痕量金属。样品的顺序萃取分析表明，VT粉尘中的Pb最常与可交换+碳酸盐相和可还原相相关，而矿区以外的道路粉尘在总浓度中所占的比例较大，与可移动的可氧化相和残留地球化学相相关。体外模拟体液提取显示，开采的道路扬尘中总铅浓度的多达78％和100％是分别通过胃液和人工肺液提取的。来自所有粉尘样品的逐次萃取物中铅的同位素比值显示出最小的差异，表明各操作阶段之间存在混合；但是，三组分末端成员的混合有助于在熔炉沉积和/或短途道路运输，天然基岩土壤和美国气溶胶中分配总不稳定的铅。

著录项

  • 作者

    Witt, Emitt Cleveland, III.;

  • 作者单位

    Missouri University of Science and Technology.;

  • 授予单位 Missouri University of Science and Technology.;
  • 学科 Environmental Geology.;Geochemistry.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 254 p.
  • 总页数 254
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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