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"Distribution and characterization of forms of Fe and Al in particle-size fractions of an Etnic Haplustoll by selective dissolution techniques, X-ray powder diffraction and Mössbauer spectroscopy"
S.G. Acebal, M.E. Aguirre, R.M. Santamaría, A. Mijovilovich, S. Petrick and C. Saragovi
Proc. of the "12th International Clay Conference" and "3rd International Symposium on Activated Clays", Bahía Blanca, Buenos Aires, Argentina, July 22-28, 2001. Ed. E.A. Dominguez, G. Mas and F. Cravero
2001. A Clay Odyssey, University, Elsevier Science (2003) 379-386
ISBN: 978-044450945-1
Aggregate stability depends on soil properties such as organic matter content, type and quantity of clay and poorly crystalline Fe and Al oxide and oxy-hydroxides. Then, the quantification and characterization of forms of Fe and Al are of major importance for understanding soil structure. Particle-size fractions (5-2 µm, 2-1 µm, and < 1µm) from the Ap horizon of an Entic Haplustoll from Argentina, treated with the selective-dissolution techniques ammonium oxalate (OX), dithionite-citrate-bicarbonate (DCB), NaOH, and Napyrophosphate (PY), are studied by X-ray powder diffraction (XRD) and 57Fe Mössbauer spectroscopy (MS). Quartz, feldspar, smectite, illite and interstratified illite-smectite are predominant whereas Fe and Al oxides and oxy-hydroxides are present in low concentration. Al-substituted hematite and poorly crystallized hematite and goethite are present in similar proportions.
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