Trace element associations with Fe- and Mn-oxides in soil nodules: Comparison of selective dissolution with electron probe microanalysis |
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| Authors: | Alexander Neaman Carmen Enid Martínez Fabienne Trolard Guilhem Bourrié |
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| Institution: | 1. Área de Medio Ambiente, Facultad de Agronomía, Pontificia Universidad Católica de Valparaíso, Casilla 4-D, Quillota, Chile;2. Centro Regional de Estudios en Alimentos Saludables, Región de Valparaíso, Chile;3. Department of Crop and Soil Sciences, The Pennsylvania State University, University Park, PA 16802, USA;4. INRA, UR 1119, Géochimie des Sols et des Eaux, BP 80, 13545 Aix-en-Provence cedex 04, France |
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| Abstract: | Selective dissolution methods have been largely used to get insight on trace element association with solid phases. Modern instrumental techniques offer many tools to test the validity of selective dissolution methods and should be systematically used to this end. The association of trace elements with Fe- and Mn-oxides in soil nodules has been studied here by electron probe microanalysis. The results were compared with findings from an earlier study on selective dissolution of the same nodules by hydroxylamine hydrochloride, acidified hydrogen peroxide, and Na-citrate-bicarbonate-dithionite. Electron probe microanalysis results were consistent with previous findings using selective dissolution and showed that P, As and Cr were mainly present in Fe-oxides, while Co was mainly associated with Mn-oxide phases. These results support the applicability of the studied selective dissolution methods for fractionation of trace elements in soils and sediments containing appreciable amounts of Fe and Mn-oxide phases. |
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| Keywords: | Hydroxylamine-hydrochloride Hydrogen-peroxide Citrate-bicarbonate-dithionite Tropical-soil EPMA Iron-oxides Manganese-oxides Fractionation |
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