Trace element associations with Fe- and Mn-oxides in soil nodules: Comparison of selective dissolution with electron probe microanalysis

ALEXANDER NEAMAN , Carmen Enid Martínez, Fabienne Trolard, Guilhem Bourrié

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

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.

Original languageEnglish
Pages (from-to)778-782
Number of pages5
JournalApplied Geochemistry
Volume23
Issue number4
DOIs
StatePublished - 1 Apr 2008

Keywords

  • Citrate-bicarbonate-dithionite
  • EPMA
  • Fractionation
  • Hydrogen-peroxide
  • Hydroxylamine-hydrochloride
  • Iron-oxides
  • Manganese-oxides
  • Tropical-soil

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