The Influence of Calcium Carbonate Grain Coatings on Contaminant Reactivity in Vadose Zone Sediments

Zachar, John M. ; Chambers, Scott ; Brown Jr, Gordon E. ; Eggleston, Carrick M.

Pacific Northwest National Laboratory (U.S.)

关键词: Sediments;    Adsorption;    Coprecipitation;    54 Environmental Sciences;    Coatings;   

DOI  :  10.2172/833530
RP-ID  :  EMSP-70121--2002
RP-ID  :  FG07-99ER15024
RP-ID  :  833530

美国|英语

来源: UNT Digital Library

【 摘 要 】

The primary objective of this project is to investigate the role of calcium carbonate grain coatings on adsorption and heterogeneous reduction reactions of key chemical and radioactive contaminants in sediments on the Hanford Site. Research will ascertain whether these coatings promote or discourage contaminant reaction with sediment mineral particles, and whether calcium carbonate phases resulting from waste-sediment reaction sequester contaminants through coprecipitation. The research will provide new conceptual models of contaminant reaction/retardation processes in Hanford sediments (for 90Sr2+ and Cr(VI)O4 2- primarily) and improved geochemical models to forecast the future behavior of in-ground contaminants.