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Ground Water Chemistry

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

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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Our project uses techniques of low-temperature geochemistry to interpret and characterize chemical processes, such as precipitation of calcium carbonate in surface lake water (see Photo below), occurring in surface water and ground water. We study metal binding by dissolved organic matter and crystal growth and dissoluton reaction rate mediation by dissolved constituents because metal ion speciation and mineral formation rates influence water quality and carbon storage. Metal ion complexation with organic matter mediates metal ion reactivity in surface water and ground water -- metal ion speciation controls metal ion chemical and biogeochemical reactivity and bioavailability.

We determine equilibrium metal species distributions in surface and ground water containing organic matter, and characterize crystal growth and dissoluton rates in surface and ground water containing organic material.

Pyramid Lake Map

Pyramid Lake Photos

Hot Springs at the Needles Area of Pyramid Lake, NV (below) shows active calcium carbonate precipitation (photo by Michael Reddy, USGS). For more information see Reddy and Hoch 2012 on-line pdf report.

This picture shows calcium carbonate formation in Pyramid Lake, Nevada caused by mixing hydrothermal water with lake water

Recent News

Project interests:

  • Calcium carbonate nucleation and growth in surface and groundwater
  • Calcium carbonate formation and dissolution in arid soils at the Amargosa Desert Research Site located near Beatty, Nevada.
Recent Publications

Reddy, M.M., 2013, Calcite growth-rate inhibition by low-moleclar weight polycarboxylate ions, in Amjad, Z., ed., Mineral Scale in Biological and Industrial Systems, Accepted.

Reddy, M.M., 2012, Calcite growth-rate inhibition by fulvic acid and magnesium ion -- possible influence on biogenic calcite formation: Journal of Crystal Growth, V. 352, p., 151-154, DOI:10.1016/j.jcrysgro.2011.12.069. (on-line journal article)

Reddy, M.M. and Gunther, C.D., 2012, Summary of chemical data from onsite and laboratory analyses of groundwater samples from the surficial aquifer, Las Vegas, Nevada, April and August 1993 and September 1994. U.S. Geological Survey Open-File Report 2012-1029, 18 p. (on-line report)

Reddy, M.M. and Gunther, C.D., 2012, Summary of data from onsite and laboratory analyses of surface water and marsh porewater from South Florida Water Management District Water Conservation Areas, the Everglades, South Florida, March 1995, U.S. Geological Survey Open-File Report 2012-1063, p. 14. (on-line report)

Reddy, M.M. and Hoch, A., 2012, Calcium carbonate nucleation in an alkaline lake surface water, Pyramid Lake, Nevada, USA. Aquatic Geochemistry, v. 18, No. 2, p. 95-113, DOI: 10.1007/s10398-011-9150-3. (on-line pdf report)

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