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Hyperfine Interactions

, Volume 148, Issue 1–4, pp 3–12 | Cite as

Selective Dissolution Techniques, X-Ray Diffraction and Mössbauer Spectroscopy Studies of Forms of Fe in Particle-Size Fractions of an Entic Haplustoll

  • S. G. Acebal
  • M. E. Aguirre
  • R. M. Santamaría
  • A. Mijovilovich
  • S. Petrick
  • C. Saragovi
Article
  • 40 Downloads

Abstract

Particle-size fractions (∅ = mean diameter, 5–2 μm, 2–1 μm, and <1 μm) from the Ap horizon of an Entic Haplustoll from Argentina were treated with the selective-dissolution techniques ammonium oxalate (OX), dithionite-citrate-bicarbonate (DCB), NaOH, and Na-pyrophosphate (PY), and studied by X-ray powder diffraction (XRD) and 57Fe Mössbauer spectroscopy (MS). Quartz, feldspar, smectite, illite and interstratified illite-smectite are the dominant minerals whereas Fe oxides and oxy-hydroxides are present in low concentration but increase as particle size decreases. Poorly crystallized oxides (highly Al-substituted hematite and goethite) amounts are lower, comparable to or slightly higher than the hematite amounts in the ∅ = 5–2 μm, 2–1 μm and <1 μm fractions respectively. This hematite is well crystallized but presents some degree of Al-substitution. Magnetite/maghemite was identified in the 2–1 μm fraction. Paramagnetic Fe3+ and Fe2+ are associated to the clay minerals and/or hydroxyl-interlayered 2:1 type material present; part of this Fe3+ is located in the hydroxy-interlayers its amount being higher in the smallest fraction. Any possible changes after the PY and NaOH treatments were not detected by MS.

Haplustolls Fe mineralogy selective dissolution techniques Mössbauer spectroscopy X-ray diffraction 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • S. G. Acebal
    • 1
  • M. E. Aguirre
    • 2
  • R. M. Santamaría
    • 3
  • A. Mijovilovich
    • 4
  • S. Petrick
    • 5
  • C. Saragovi
    • 6
  1. 1.Department of ChemistryUniversidad Nacional del Sur Av. Alem 1253Bahía BlancaArgentina
  2. 2.Department of AgronomyUniversidad Nacional del SurBahía BlancaArgentina
  3. 3.Comisión de Investigaciones Científicas de la Provincia de Buenos AiresCICArgentina
  4. 4.EMBL c/o DESYHamburgGermany
  5. 5.Facultad de CienciasUniversidad Nacional de IngenieríaLimaPerú
  6. 6.Department of PhysicsComisión Nacional de Energía AtómicaBuenos AiresArgentina

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