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MULTISPECIES REACTIVE TRACER TEST IN A SAND AND GRAVEL AQUIFER, CAPE COD, MASSACHUSETTS: PART 2: TRANSPORT OF CHROMIUM (VI) AND LEAD-, COPPER-, AND ZINC-EDTA TRACERS
Citation:
Davis, J. A., J. A. Coston, D. B. Kent, K. M. Hess, J. L. Joye, P. Brienen, AND K. W. Campo. MULTISPECIES REACTIVE TRACER TEST IN A SAND AND GRAVEL AQUIFER, CAPE COD, MASSACHUSETTS: PART 2: TRANSPORT OF CHROMIUM (VI) AND LEAD-, COPPER-, AND ZINC-EDTA TRACERS. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-01/007b (NTIS PB2002-100573), 2001.
Impact/Purpose:
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Description:
This report discusses the transport of a group of reactive tracers over the course of a large-scale, natural gradient tracer test conducted at the USGS Cape Cod Toxic Substances Hydrology Research site, near Falmouth, Massachusetts. The overall objectives of the experiment were to demonstrate the importance of variable aquifer chemistry on chemical reactions, including aqueous speciation changes, during transport of toxic elements in groundwater (chromate, and four metals complexed with the organic ligand EDTA: Pb, Cu, Zn, Ni). In addition, the field experiment was designed to collect enough data to investigate the problem of modeling flow coupled with chemical reactions with a view towards simplification of the geochemical reaction network. The variable chemical conditions at the field site and the transport of conservative Br and weakly reactive Ni-EDTA complexes are described in a companion report. The main conclusions of the companion report were that: 1) Br was transported conservatively; 2) EDTA and Ni-EDTA were reversibly adsorbed to the aquifer sediments during transport, with only slight retardation relative to Br; 3) the masses of total dissolved EDTA and Ni were nearly constant during the tracer test after the initial adsorptive equilibrium was reached; and 4) the injected metals, except for Zn and Cr, were transported entirely as metal-EDTA complexes. Observed tracer retardation was most extensive under the low pH conditions of the pristine zone, a conclusion consistent with earlier smaller scale tracer studies of metal-EDTA complexes.
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MULTISPECIES REACTIVE TRACER TEST IN A SAND AND GRAVEL AQUIFER, CAPE COD, MASSACHUSETTS: PART 2: TRANSPORT OF CHROMIUM (VI) AND LEAD-, COPPER-, AND ZINC-EDTA TRACERSPart 1.