Geochemical processes, mineral-water

Hayes, K.F. Leckie, J.O. (1986) Mechanisms of lead adsorption at the goethite-water interface. In Davis, J.A. Hayes, K.F. (eds.) Geochemical processes at mineral surfaces. ACS Symp. Ser. 323, Am. Chem. Soc. Washington D.C., 114-141... 

The combustion process activates mineral ash with the result that leachates extract relatively high proportions of elements whose concentrations in potable water are limited. We are as yet some way from understanding the speciations of these elements in combustion waste as well as the geochemical evolution of waste in its disposal environment. Preliminary studies show that the design, construction, and operation of disposal sites have a major influence on releases. The underlying geochemical processes are at present only known in outline and provide a fascinating field for interdisciplinary studies. 

See, for example, pp. 403-406 in E. M. Thurman, Organic Geochemistry of Natural Waters, Martinus Nijhoff, Dordrecht, The Netherlands, 1986, and T. D. Waite, Photoredox chemistry of colloidal metal oxides, Chap. 20 in Geochemical Processes at Mineral Surfaces, ed. by J. A. Davis and K. F. Hayes, American Chemical Society, Washington, DC, 1986. 

Alpers C. N. and Nordstrom D. K. (1999) Geochemical modelling of water-rock interactions in mining environments. In Reviews in Economic Geology, vol. 6A, The Environmental Geochemistry of Mineral Deposits Part A. Processes, Methods and Health Issues, (eds. G. S. Plumlee and M. J. Logsdon). Soc. Econ. GeoL, Littleton, CO, pp. 289-324. 

Effects on Geochemical Processes at the Mineral-Water Interface... 

Many IMPORTANT GEOCHEMICAL PROCESSES occur at mineral-water interfaces. Iron and aluminum are mobilized in soils by the dissolution of oxide md silicate minerals or of amorphous oxide coatings on soil minerals (I, 2). The leaching of iron and aluminum immediately below the organic-rich layers... 

Paul Fenter attended the Rensselaer Polytechnic Institute from 1980-1984 where he received a B.S. in Physics, and attended the University of Pennsylvania from 1984-1990 graduating with a PhD. in Physics. From 1990-1997 he was a postdoctoral fellow and then a research staff member at Princeton University. He joined the staff at Argonne National Laboratory in 1997 where he uses synchrotron X-ray scattering techniques to probe geochemical processes at mineral-water interfaces. 

The long-term performance of the repository at Yucca Mountain will be affected by the coupling of thermal, hydrological and chemical (THC) processes in the rock around the emplacement drifts. The transport of heat, fluid, and vapor will result in changes in water and gas chemistry, as well as mineral dissolution and precipitation which may lead to permanent changes in porosity, permeability and unsaturated hydrological properties. The purpose of this contribution is to describe the approach used to model reaction-transport processes in the Drift Scale Test (DST) with comparisons of simulation results to measured geochemical data on water, gas, and minerals. 

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