Wednesday, November 7, 2007 - 9:45 AM
326-2

Soil Extraction Methods and Ecotoxicity Endpoints of Lettuce and Earthworms in Arsenic (V) Contaminated Soils.

Elizabeth Dayton, School of Environment and Natural Resources, Ohio State University, The Ohio State University, 2021 Coffey Rd 210 Kottman Hall, Columbus, OH 43210-1085, Nicholas Basta, SENR, The Ohio State University, 2021 Coffey Rd, Columbus, OH 43210-1085, Karen Bradham, National Exposure Research Laboratory, U.S. EPA, 109 T.W. Alexander Dr., Research Triangle Park, NC 27711, and Shane Whitacre, SENR, Ohio State University, 2021 Coffey Road, Columbus, OH 43210-1085.

Soil arsenic extractions were used across a wide range of soils to predict ecotoxicity endpoints in lettuce and earthworms. Twentyone soils were spiked with 250 mg As/kg. Lettuce and earthworm bioassays were conducted. Biological endpoints for lettuce (dry matter growth and tissue As) and earthworms (reproduction, tissue As and mortality) were determined. Six different soil extraction methods were used to determine if extractions could predict ecotoxicity. Results showed some extractions were excellent predictors of ecological endpoints and could predict effect concentrations (EC20, EC50). Further, 4 of the 6 extractions predicted the As tissue concentration at EC20 and EC50 for lettuce.

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