HR: 14:10h
AN: NS13A-03    [Abstracts]
TI: Low Frequency Electrical Responses From Simulated ZVI PRBs With High Carbonate Concentration
AU: * Wu, Y
EM: yuxin.wu@inl.gov
AF: Idaho National Laboratory, PO Box 1625, Idaho Falls, ID 83415, United States
AU: Versteeg, R J
EM: roelof.versteeg@inl.gov
AF: Idaho National Laboratory, PO Box 1625, Idaho Falls, ID 83415, United States
AU: Slater, L
EM: lslater@andromeda.rutgers.edu
AF: Rutgers University, 101 Warren Street, Newark, NJ 07102, United States
AU: LaBrecque, D
EM: dlabrecque@mpt3d.com
AF: Multi-phase Technologies, 420 S. Rock Blvd, Sparks, NV 89431, United States
AB: We conducted column experiment to investigate the electrical signatures from iron corrosion and mineral precipitation occurring in two simulated PRBs with high carbonate groundwater conditions. Our results reveal consistent increase of electrical resistivity and decrease of polarization magnitude for all the columns. Solid phase analysis identified calcium carbonate (calcite and aragonite) being a major mineral phase at all the channels with magnetite being another major phase at the 2-3 channels closest to the influent ends. Our electrical data correlate well with the reaction process and suggested calcium carbonate being the major mineral phase controlling the change of electrical signatures in a system with both calcium carbonate and iron oxides being major phases. Our results demonstrate that electrical methods have sufficient sensitivity in indirectly sensing the iron corrosion and mineral precipitation process occurring in ZVI PRBs and are potential tools for long term performance monitoring of PRBs.
DE: 1042 Mineral and crystal chemistry (3620)
DE: 1835 Hydrogeophysics
SC: Near-Surface Geophysics [NS]
MN: 2007 Fall Meeting