Field evaluation of arsenic transport across the groundwater/surface water interface: Speciation in sediment material

GEOC 125

Kirk G. Scheckel, scheckel.kirk@epa.gov, Waste Management Branch, U.S. Environmental Protection Agency, 5995 Center Hill Ave, Cincinnati, OH 45224, Robert G. Ford, ford.robert@epa.gov, Land Remediation and Pollution Control Division, U.S. Environmental Protection Agency, 26 W Martin Luther King Dr, Cincinnati, OH 45268, Aaron G. B. Williams, awilliams@envplanning.com, Environmental Planning Specialists, Inc, Atlanta, GA, Todd P. Luxton, Waste Management Branch, United States Environmental Protection Agency, 5995 Center HIll Avenue, Cincinnati, OH 45224, Patrick Clark, National Risk Management Research Laboratory, US-EPA, Cincinnati, OH 45268, and Brad Scroggins, Scroggins.Brad@epa.gov, GWERD, U.S. Environmental Protection Agency, Ada, OK.
The solubility and mobility of arsenic in ground water are influenced by a variety of processes in the northeastern US subjective to geogenic and anthropogenic sources. This presentation will discuss the speciation of arsenic in sediment profiles resulting from ground water discharge into a surface water body. This investigation is part of a study to examine arsenic distribution in ground water, surface water, and sediments within the Red Cove Study Area of Plow Shop Pond adjacent to Shepley's Hill Landfill at the Fort Devens Superfund Site (companion presentation by R.G. Ford et al).

The ground water discharge into the Red Cove Study Area is characterized as having high ferrous iron (up to 60 mgL-1) and arsenic concentrations as high as 1 mgL-1. Sediment cores were collected across three transects of the Red Cove Study Area. The surface water – sediment interface typically possessed the highest concentration of arsenic reaching levels above 800 mg kg-1. XAS was employed to determine the speciation of arsenic in sediment samples. Arsenic speciation varied to identify arsenate and arsenite bound to iron oxides and sulfides.

 

Speciation of Arsenic and Other Trace Elements in Soils and Sediments
1:25 PM-5:10 PM, Wednesday, April 9, 2008 Morial Convention Center -- Rm. 211, Oral

Division of Geochemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008