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REVIEWS AND ANALYSES

Methods for Speciation of Metals in Soils

A Review

^a 3507 Middleton Avenue, Cincinnati, OH 45220
^b USEPA, ORD, NRMRL, 5995 Center Hill Avenue, Cincinnati, OH 45224

^* Corresponding author (Ryan.Jim{at}epa.gov)

Received for publication January 14, 2004. The inability to determine metal species in soils hampers efforts to understand the mobility, bioavailability, and fate of contaminant metals in environmental systems, to assess health risks posed by them, and to develop methods to remediate metal contaminated sites. Fortunately, great strides have been made in the development of methods of species characterization and in their application to the analysis of particulates and mixtures of solid phases in physics, analytical chemistry, and materials science. This manuscript highlights a selection of the analytical methods available today offering the greatest promise, briefly describes the fundamental processes involved, examines their limitations, points to how they have been used in the environmental and geochemical literature, and offers some suggested research directions in the hope of stimulating further investigation into the application of these powerful tools to the problems outlined above.

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