SOIL OXIDANT DEMAND DURING CHEMICAL OXIDATION OF TRICHLOROETHYLENE BY PERMANGANATE IN SOIL MEDIA

摘要

The soil oxidant demand (SOD) for KMnO_4 determined by completely mixed batch systems was orders of magnitude greater than that determined by column systems, most likely because more reactive substances were made in the batch systems as soil particles were pulverized due to vigorous stirring. The SOD determined by the column systems were ～0.9 and ～1.2 mg/kg dry-soil for a sandy soil and a gravel-sand-silty soil, respectively. Although the background soil constituents made only ～3% difference in SOD between the two soils, the gravel-sand-silty soil spiked with pure phase TCE had a SOD five times greater than its uncontaminated soil. The results indicate that the protons produced from the TCE-KMnO_4 reactions may react with the gravel-sand-silty soil, resulting in more oxidizable substances to consume KMnO_4. For the sandy soil, neither the KMnO_4 concentration nor the presence of TCE in soil had significant effect on the SOD.