/inca/publications/misc/622551sample5.pdf Sample chapter
Volume 5 has several objectives. The first is to present an overview of the composition of surface and ground waters on the continents and the mechanisms that control the compositions. The second is to present summaries of the tools and methodologies used in modern studies of the geochemistry of surface and ground waters. The third is to present information on the role of weathering and soil formation in geochemical cycles: weathering affects the chemistry of the atmosphere through uptake of carbon dioxide and oxygen, and paleosols (preserved soils in the rock record) provide information on the composition of the atmosphere in the geological past.
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The focus of my research is to understand the processes, inorganic and biological, that control the chemistry of surface water and groundwater. I have worked for many years on the weathering of silicate minerals and silicate dissolution kinetics, both from the perspective of global cycles and global climate (weathering is the most important long-term mechanism for removal of CO 2 from the atmosphere) and from the perspective of anthropogenic effects such as acid rain and acid mine drainage. In the last few years, the emphasis has been more on pollutant geochemistry. We have been studying the processes controlling the movement of arsenic in groundwater, the chemistry of a high-elevation stream affected by acid mine drainage, and the use of stable isotopes (C, O, N, C1) to identify the source of contaminants and to quantify microbial degradation of contaminants in the subsurface.
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