Chemical characterization of contaminated media and soils Chemical analysis show all study soils and media contained elevated levels of arsenic, lead, zinc, copper and nickel. Arsenic occurs in oxide and sulfate based minerals in contaminated samples. Samples contained significant amounts of sulfate and chloride which may influence the solubility and possibly the bioavailability of anionic arsenate. Chemical speciation of contaminated media Chemical speciation of arsenic was accomplished by using various extracting solutions to extract As from contaminated soils. In-vivo pig feeding study Results from pig feeding trials involving two contaminated materials have been conducted.
Research is in progress for the remaining contaminated soils.
Arsenic in soil and contaminated media is being extracted by two in-vitro methods that simulate the gastrointestinal system. Arsenic dissolved by simulated stomach and by simulated intestinal processes is being measured for each in-vitro method. Rodriguez, R. R., N. T. Basta, and S.W. Casteel. Quantifying bioavailable arsenic in contaminated soils by in-vitro gastrointestinal methods. Nov. 16-20, 1997.