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Dr. John Zachara has performed extensive experimental research on various geochemical and biogeochemical processes that control the concentrations, fate, and transport of organic, metal and radionuclide contaminants in subsurface environments. The research has ranged from fundamental surface chemical and spectroscopic studies of mineral suspensions in the laboratory, to comprehensive studies of solute mobilization and transport in the field. He has been active in evaluating complex co-contaminant interactions that occur in contaminant mixtures and in applying multi-component adsorption models to contaminant binding in mineralogically complex natural materials. He has made important contributions to understanding how microorganisms interact with mineral surfaces through his long-term collaboration with microbiologist Dr. Jim Fredrickson.
Dr. Zachara's current research is focused on the geochemical behavior of metals and radionuclides with emphasis on the Hanford site, the influence of subsurface microbial processes on mineral surface chemistry and mineralization, and reactive transport chemistry. His research is assisted by applications of electron microscopy, scanning probe microscopy, Mössbauer spectroscopy, laser-induced fluorescence spectroscopy, and x-ray absorption spectroscopy. Dr. Zachara has been committed to identifying and performing fundamental research that provides basis for remedial action and closure decisions at the Hanford site.
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Nature Communicationsno. 1 (2018)
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