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Ground Water Chemistry

Aqueous Crystal Growth and Dissolution Kinetics of Calcium Carbonate Minerals - Welcome

Michael M. Reddy



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Project Activity at the USGS Toxics Program Research Site, the Amargosa Desert Research Site (ADRS), near Beatty, Nevada

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Calcium carbonate formation - Supersaturated solution

Project work on calcium carbonate reaction kinetics has important application in several areas of Earth Science, including water quality concerns and the global carbon budget. The mechanism of natural organic matter mediation of carbonate minerals growth and dissolution rates remains largely unknown. We use laboratory, field, and theoretical approaches to study calcium carbonate formation and dissolution rates in surface water and groundwater systems.

Important aspects of project researach include characterization of the interaction of natural organic material with calcium carbonate surfaces during crystal growth and dissolution. We develop models to evaluate natural organic material influence on calcium carbonate crystal growth and dissolution kinetics. Other project activities focus on the development and verification of methods to characterize natural organic matter-metal ion speciation.

Project staff sample surface and ground water for chemical and isotopic composition related to calcium carbonate formation and dissolution. We use geochemical mass balance calculations to identify possible calcium carbonate formation and dissolution reactions in a range of surface and ground water settings. Project staff also monitor calcium carbonate crystal growth and dissolution in conjunction with tools developed for dating young groundwaters.

For more information visit the National Research Program.

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Project Contact Information:Michael M. Reddy
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Page Last Modified: April 20, 2015