Caustic Waste-Soil Weathering Reactions and Their Impacts on Trace Contaminant Migration and Sequestrations. Annual Progress Report, 2002-2003.

Chorover, J. ; Mueller, K. T.

Technical Information Center Oak Ridge Tennessee

关键词: Clays;    Soils;    Weathering;    Contaminants;    Sequestration;   

RP-ID  :  DE2005838400

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

High pH waste solutions are in gross chemical disequilibrium with the subsurface environment and react with sediment minerals, promoting dissolution and precipitation processes that impact 137Cs, 90Sr, and 129I speciation and migration behavior in the vadose zone. We have conducted long-term kinetic studies, with reaction times ranging from 1 to 369 d, to examine relationships between aluminosilicate weathering in the presence of synthetic tank waste leachate (STWL) and contaminant uptake and release. Our experiments employ a sequence of specimen clay minerals including illite, vermiculite, montmorillonite and kaolinite, which are also important reactive solids in the Hanford sediments. These studies have shown direct coupling between mineral transformation reactions and contaminant sequestration/stabilization.