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    Boron isotopes as intrinsic and artificial hydrologic tracers

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    Author
    Quast, Konrad William
    Issue Date
    2003
    Keywords
    Hydrology.
    Advisor
    Lansey, Kevin
    
    Metadata
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    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
    This work investigates the conservative behavior of boron isotopes and their potential use as an artificial hydrologic tracer. The usefulness of boron isotopes as intrinsic hydrologic tracers and the assumption that boron isotopes are conservative in many natural environments led to the hypothesis that they can be easily adapted as artificial hydrologic tracers. The results are demonstrated in three field studies and a laboratory study carried out under the Soil Aquifer Treatment project. Non-conservative behavior of intrinsic boron isotope ratios was found in vadose zone and groundwater samples. Although this behavior was recognized, its overall importance is relatively small when compared to the range of values found in the vicinity of the field site that ranged from 0 to 39‰. Fractionation of boron isotopes from its source value, domestic effluent with a range of 0 to 6‰; and an average of 3‰, is on the order of 2‰ and is confirmed by a laboratory study. The fractionation is in part related to the humic acid found in organic matter collected from recharge basin surface soils. Boron isotopes, specifically boric acid enriched in 10B, were successfully applied as an artificial tracer. Xenon and oxygen/hydrogen isotopes, and sulfate support interpretation of boron tracer results. However, non-conservative behavior of boron isotopes is also identified in this artificial tracer study. The non-conservative behavior is demonstrated by the late breakthrough of the boron isotope tracer, two days later, relative to that of xenon isotopes added by researchers from Lawrence Livermore Laboratory.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Hydrology and Water Resources
    Degree Grantor
    University of Arizona
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