SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS

Room temperature Mössbauer spectra of bulk Chilean soil samples derived from volcanic materials (Ultisols and Andisols) are very complex and least-squares fitting not seldom leads to many different interpretations. In most cases the presence of commonly occurring iron oxides in those soils, namely m...

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Autores principales:	PIZARRO,C., FURET,N., VENEGAS,R., FABRIS,J. D., ESCUDEY,M.
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2000
Materias:	Mössbauer spectroscopy iron oxides volcanic soils soil mineralogy
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000200011
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spelling	oai:scielo:S0366-164420000002000112000-08-25SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILSPIZARRO,C.FURET,N.VENEGAS,R.FABRIS,J. D.ESCUDEY,M. Mössbauer spectroscopy iron oxides volcanic soils soil mineralogy Room temperature Mössbauer spectra of bulk Chilean soil samples derived from volcanic materials (Ultisols and Andisols) are very complex and least-squares fitting not seldom leads to many different interpretations. In most cases the presence of commonly occurring iron oxides in those soils, namely maghemite (ideal formula, g Fe2O3), hematite ( gFe2O3) and goethite (aFeOOH) in Andisols, and maghemite, magnetite (Fe3O4), ferrihydrate (Fe5HO8.4H2O) and/or goethite in the Ultisol can only be speculated. In the present paper we present X-ray diffraction and Mössbauer analyses of particle size fractions (soil, sand, silt and clay), which were submitted to magnetic extraction (sand fractions) and subsequently to NaOH selective chemical treatment (silt and clay fractions), in laboratory procedures which were conveniently adapted to such volcanic soil-samples. When chemically treated soil separates of Ultisol are analyzed, the presence of partially oxidized magnetite is confirmed, and the existence of hematite is also inferred. The magnetic fraction separation and chemical treatments are to be essential steps in sample preparation in the mineralogical assessment of Chilean soils derived from volcanic materialsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaBoletín de la Sociedad Chilena de Química v.45 n.2 20002000-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000200011en10.4067/S0366-16442000000200011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Mössbauer spectroscopy iron oxides volcanic soils soil mineralogy
spellingShingle	Mössbauer spectroscopy iron oxides volcanic soils soil mineralogy PIZARRO,C. FURET,N. VENEGAS,R. FABRIS,J. D. ESCUDEY,M. SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS
description	Room temperature Mössbauer spectra of bulk Chilean soil samples derived from volcanic materials (Ultisols and Andisols) are very complex and least-squares fitting not seldom leads to many different interpretations. In most cases the presence of commonly occurring iron oxides in those soils, namely maghemite (ideal formula, g Fe2O3), hematite ( gFe2O3) and goethite (aFeOOH) in Andisols, and maghemite, magnetite (Fe3O4), ferrihydrate (Fe5HO8.4H2O) and/or goethite in the Ultisol can only be speculated. In the present paper we present X-ray diffraction and Mössbauer analyses of particle size fractions (soil, sand, silt and clay), which were submitted to magnetic extraction (sand fractions) and subsequently to NaOH selective chemical treatment (silt and clay fractions), in laboratory procedures which were conveniently adapted to such volcanic soil-samples. When chemically treated soil separates of Ultisol are analyzed, the presence of partially oxidized magnetite is confirmed, and the existence of hematite is also inferred. The magnetic fraction separation and chemical treatments are to be essential steps in sample preparation in the mineralogical assessment of Chilean soils derived from volcanic materials
author	PIZARRO,C. FURET,N. VENEGAS,R. FABRIS,J. D. ESCUDEY,M.
author_facet	PIZARRO,C. FURET,N. VENEGAS,R. FABRIS,J. D. ESCUDEY,M.
author_sort	PIZARRO,C.
title	SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS
title_short	SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS
title_full	SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS
title_fullStr	SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS
title_full_unstemmed	SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS
title_sort	some cautions on the interpretation of mössbauer spectra in mineralogical studies of volcanic soils
publisher	Sociedad Chilena de Química
publishDate	2000
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000200011
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SOME CAUTIONS ON THE INTERPRETATION OF MÖSSBAUER SPECTRA IN MINERALOGICAL STUDIES OF VOLCANIC SOILS

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