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We are interested in the chemistry of soils, sediments, aquifers, and other environments under both natural and contaminated settings. The chemistry in these environments is complicated, due to the overlapping controls by diverse physical, chemical, and biological processes. Our research questions range from theoretical to practical, from the fate of arsenic and other contaminants to the influence of environmental chemistry on biological processes. Our goal is to elucidate and predict how environmental chemistry evolves with time across different spatial and temporal scales.