Abstract
An electrokinetic process for in situ remediation of anionic contaminants from unsaturated soil is under development at Sandia National Laboratories in Albuquerque, New Mexico. The electromigration rate of anionic food dye ions through unsaturated sand under constant current conditions was measured at various moisture contents ranging from 4 wt% to 27 wt%. The results indicate a maximum migration rate at moisture contents between 14 wt% and 18 wt% water. The drop in the electromigration rate at lower moisture contents is explained by rapid increases in pore tortuosity. The decrease of the migration rate at higher moisture contents is explained by the expected decrease in the pore water current density. In an experiment using chromate ions, the chromate moved faster than dye ions in an analogous experiment. This was expected because chromate is a smaller molecule. When the chromate reached the graphite anode, it apparently migrated into the slightly porous graphite.
Published Version
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