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SEQUENTIAL EXTRACTIONS FOR PARTITIONING OF ARSENIC ON HYDROUS IRON OXIDES AND IRON SULFIDES
Citation:
Paul*, C J. AND R Ford*. SEQUENTIAL EXTRACTIONS FOR PARTITIONING OF ARSENIC ON HYDROUS IRON OXIDES AND IRON SULFIDES. World Water Resource Congress, Orlando, FL, 5/20-24/01.
Description:
The objective of this study was to use model solids to test solutions designed to extract arsenic from relatively labile solid phase fractions. The use of sequential extractions provides analytical constraints on the identification of mineral phases that control arsenic mobility. Arsenic removal from solution may occur through sorption to or co-precipitation with soil or sediment mineral phases. Single step and sequential extractions were performed on model solids to determine the amount of arsenic associated with different iron and sulfur phases. Arsenic associated phases were categorized as 1) weakly adsorbed, 2) strongly adsorbed, 3) co-precipitated with amorphous Fe(III) oxides, and 4) co-precipitated with iron monosulfides. Results of this study will be used to help constrain the interpretation of extraction data collected for contaminated soils and sediments.