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Applied and Environmental Soil Science
Volume 2009 (2009), Article ID 243482, 6 pages
http://dx.doi.org/10.1155/2009/243482
Research Article

Partitioning of Iron and Scandium in Soils Having Water Drainage Limitations

Department of Agriculture, Southeast Missouri State University, One University Plaza, Cape Girardeau, MO 63701, USA

Received 13 April 2009; Accepted 5 October 2009

Academic Editor: Sabine Goldberg

Copyright © 2009 Michael Aide et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Soil chemistry of Fe includes weathering reactions, adsorption, hydrolysis, complexation, and oxidation-reduction reactions. Soil chemistry for scandium (Sc) is similar, but Sc does not include oxidation-reduction reactions. To determine if geochemical analysis may be used to identify Sc partitioning with respect to Fe among the particle size fractions, two Alfisol and two Ultisol soils were assessed using an aqua-regia digestion to estimate Sc and Fe concentrations for whole soil and particle size separates. Aqua-regia digestion data showed Sc depletion relative to Fe in sand separate. Sand separate is largely composed on quartz sand and Fe-Mn-bearing nodules, which are redoximorphic features produced by alternating oxic and suboxic/anoxic conditions associated with seasonally fluctuating water tables. Relative partitioning of Fe and Sc in these soils warrants further study to assess if selective extractions could quantify the extent of modern or ancestral oxidation-reduction processes responsible in some soil features involved in soil genesis.