Water-waste interactions, radioactive

Eikenberg, j. Lichtner, P. C. 1992. Propagation of hyperalkaline cement pore waters into the geologic barrier surrounding a radioactive waste repository. In Kharaka, Y. K. Maest, A. S. (eds) Water-Rock Interaction. Balkema, Rotterdam, 377-380. 

This volume covers ongoing research and, thus, leaves many questions unanswered and many problems unsolved. The geochemistry of disposed radioactive wastes involves many complex issues that will require years of additional research to resolve. High-priority problems include integration of geochemical data with computer models of chemical interaction and transport, definition of environmental conditions that affect the behavior of radionuclides at specific disposal sites, evaluation of complex formation of dissolved radionuclides with inorganic and organic complexants, and determination of radionuclide solubilities in natural waters. 

The interactions of molybdate at the waste/soil interface has been studied by combining acidic, neutral and alkaline ash with sand, clay and peat respectively. The Mo tracer was added to the ash and the diffusion of Mo into the soil was measured. Since the difference in pore water concentration of Mo between coal ash and soil is large (10), the tracer reflects the behaviour of the stable Mo, consequently the Mo-radioactivity profiles can be... 

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