Speciation of Arsenic in Groundwater and Technologies for Removal of Arsenic in Drinking Water in the Spiro Tunnel Bulkhead

Application of an anion exchange resin column was performed to speciate of arsenic (III) and (V) in drinking water. This methodology was used to analyze water samples collectioned from the study of arsenic removal by two technologies, reverse osmosis membrane filtration and chemical coagulation/ filtration in pilot scale in anticipation of EPA=s new arsenic drinking water standard of 10 μg/L takes effect 2006. This EPA treatment technology project was to collect data on the performance of two existing water treatment processes to remove arsenic on pilot scale. Total arsenic concentrations were reduced by reverse osmosis from an average 60 μg/L in the source water to less than 1 μg/L, and chemical coagulation reduced total arsenic from an average 60 μg/L to 4 μg/L. The work reported here will focus on obtaining accurate readings for arsenic valence states (III) and (V), given the Edwards [17] method for arsenic speciation. Separation of arsenic As(III) and As(V) by speciation in field samples, was performed using an anion exchange resin column. The chloride interferences that affect the determination of Arsenic from chloride (35 isotope) molecular species (ArCl), were corrected using chloride measurements in all samples using equation: [As(corr)] = [As] 3.127 × {[ArCl] 0.815 [Se]}. The use of sulfuric acid in the preservation procedure ARS SEPARATORIA ACTA www.ars_separatoria.chem.