Applicability of selective dissolution of manganese oxide by acidified 0.1M NH2OH-HCl in Japanese soils

Aomi Suda, Tomoyuki Makino, Teruo Higashi

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10 Citations (Scopus)

Abstract

We investigated the extraction of manganese (Mn) oxides and iron (Fe) oxides from samples of three Andisols and seven other major Japanese soils with acidified 0.1M NH2OH-HCl in order to evaluate this method's applicability to selective dissolution of Mn oxide. The temporal changes in the amounts of Mn and Fe extracted revealed the following: 1. Mn oxides in non-volcanic-ash soil (low Alo+1/2Feo) could be dissolved semi-completely upon extraction for 30min, which is the customary extraction time. 2. Mn oxides in volcanic ash-containing soils (moderate or high Alo+1/2Feo) continued to dissolve substantially after 30min of extraction; 3. Fe oxides in all soils gradually dissolved throughout 4h of extraction, although dissolution rates in volcanic ash-containing soils were much lower than in other soils. These results indicated that the solubility of Mn and Fe oxides in volcanic ash-containing soils were low, suggesting characteristic state of the oxides in these soils, and that the method is therefore unsuitable.

Original languageEnglish
Pages (from-to)291-295
Number of pages5
JournalGeoderma
Volume163
Issue number3-4
DOIs
Publication statusPublished - 2011 Jul 15
Externally publishedYes

Keywords

  • Fe oxide
  • Hydroxylamine hydrochloride
  • Mn oxide
  • Selective dissolution
  • Volcanic ash soils

ASJC Scopus subject areas

  • Soil Science

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