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Geoscientists follow arsenic from chicken feed to streambeds

te student Mary Harvey is currently studying the adsorption potential for organic arsenic to iron oxides and clay minerals. Although much of the organic arsenic is biotransformed to inorganic arsenic before it reaches the aquifer, rapid flushing of organic arsenic in to the subsurface during storm events introduces organic arsenic to the subsurface; thus, understanding its adsorption is important.

Schreiber emphasized, "All of the arsenic concentrations we are finding at our field site are below the drinking water standards, even below the new standards of 10 parts per billion, which will come into effect in February 2006."

Schreiber is now collaborating with microbiologist John Stolz of Duquesne University, and expert on bacteria that transform arsenic. Schreiber and Stolz are looking at bacteria present in the litter and soil and the conditions under which biotransformation occurs.

Schreiber will deliver her paper, "Arsenic cycling in agricultural watersheds: The role of particles," at 3:10 p.m. at the Salt Palace Convention Center, room 250 DE. Harvey will present "Adsorption characteristics of roxarsone, an organoarsenic poultry feed additive," following Schreiber's talk. Co-authors with Harvey are Schreiber and Professor Christopher Tadanier, Research Assistant Professor of Geological Sciences at Virginia Tech.


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Source:Virginia Tech


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