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    Mobilization of Lead and Zinc in Acid Sulfate Mine Tailings

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    azu_etd_2600_sip1_m.pdf
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    Author
    Vazquez-Ortega, Angelica
    Issue Date
    2008
    Keywords
    mine tailings
    heavy metals
    lead
    zinc
    sulfate minerals
    Advisor
    Chorover, Jon
    Committee Chair
    Chorover, Jon
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    In this thesis, column experiments were conducted in order to determine the effect of irrigation with local groundwater on mobilization of lead and zinc in 50 years old sulfate-acid mine tailings. In addition, the influence of soluble oxalic acid, a common rhizosphere organic acid, was assessed by varying its concentration across an environmentally relevant range. In general, metal contaminant dissolution was not affected by the presence of oxalic acid. In both tailings, Zn mobilization was higher than Pb suggesting the presence of more kinetically labile Zn phases, regardless of the treatment used. Lead mobilization was also low because effluent solutions were near to equilibrium conditions with respect to gypsum, preventing Pb dissolution from Pb-sulfate minerals. Geochemical modeling also indicated that lead release was controlled by anglesite and plumbojarosite dissolution. Zinc release appears to be controlled by Zn-talc and goslarite.
    Type
    text
    Electronic Thesis
    Degree Name
    MS
    Degree Level
    masters
    Degree Program
    Soil, Water and Environmental Science
    Graduate College
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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