globalchange  > 气候变化事实与影响
DOI: 10.1016/j.atmosenv.2014.02.002
Scopus记录号: 2-s2.0-84894063710
论文题名:
Phase partitioning and bioaccessibility of Pb in suspended dust from unsurfaced roads in Missouri-A potential tool for determining mitigation response
作者: Witt E; C; , Shi H; , Wronkiewicz D; J; , Pavlowsky R; T
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 88
起始页码: 90
结束页码: 98
语种: 英语
英文关键词: Geochemical partitioning ; Pb contamination ; Road dust ; Sequential extraction ; Unsurfaced roads
Scopus学科分类: Environmental Science: Water Science and Technology ; Earth and Planetary Sciences: Earth-Surface Processes ; Environmental Science: Environmental Chemistry
英文摘要: Airborne particulate material collected from seventeen rural unsurfaced roads in Missouri's agricultural and resource mining areas were characterized using the BCR sequential extraction procedure and simulated invitro body fluids to determine the phase partitioning and bioaccessibility of Pb associated with roadway dusts. Results show that dusts produced from driving over unsurfaced roads in the mining area has a substantial portion of the Pb concentration associated with the more mobile exchangeable-plus-carbonate and reducible geochemical phases. By comparison, unsurfaced road dusts outside the resource mining area have lower metal contents, as expected, and a larger portion of the total Pb concentration associated with the immobile oxidizable and non-silicate bound residual phases. SEM/EDS analysis suggests the minerals associated with the more mobile Pb components include cerussite, Pb oxides and sulfates. Compared with the coarser >1μm size fraction of dust, the <1μm fraction contains a substantially higher concentration of Pb in association with clay minerals. Extraction tests using simulated body fluids show that gastric fluid can mobilize as much as 69% of the total Pb concentration in mining area road dust samples after five hours. Simulated alveolar lung fluid also was an efficient extractor of Pb from the <1μm sample dust fraction, dissolving up to 100% of the available Pb after 100h. Regression analysis suggests that aqua regia total Pb concentration is a good predictor of mobility and bioaccessibility and can be used to minimize costs associated with monitoring suspended dust contamination. © 2014 Published by Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80701
Appears in Collections:气候变化事实与影响

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作者单位: Missouri University of Science and Technology, Department of Geologic Sciences and Engineering, Rolla, MO 65409, United States; United States Geological Survey, National Geospatial Technical Operations Center, Rolla, MO 65409, United States; Missouri State University, Ozarks Environmental and Water Resources Institute, Springfield, MO 65897, United States; Missouri University of Science and Technology, Department of Chemistry, Rolla, MO 65409, United States; Missouri University of Science and Technology, Environmental Research Center for Emerging Contaminants, Rolla, MO 65409, United States

Recommended Citation:
Witt E,C,, Shi H,et al. Phase partitioning and bioaccessibility of Pb in suspended dust from unsurfaced roads in Missouri-A potential tool for determining mitigation response[J]. Atmospheric Environment,2014-01-01,88
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