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GEOREF RECORD

Crystallization of Fe(III)-oxides from ferrihydrite in salt solutions; osmotic and specific ion effects

J. Torrent and R. Guzman
Crystallization of Fe(III)-oxides from ferrihydrite in salt solutions; osmotic and specific ion effects
Clay Minerals (December 1982) 17 (4): 463-469

Abstract

Ferrihydrite transformed to crystalline Fe(III)-oxides in salt solutions but the degree of transformation generally decreased with increasing concentration (decreasing water activity) and haematite was favoured over goethite. More transformation occurred for chloride than for nitrate or sulphate and more for calcium than for magnesium or sodium. Calcium and magnesium favoured haematite over goethite. The results support the hypothesis that haematite not only can be formed but will be favoured over goethite in natural environments with low water activity, for instance dry or saline soils or sediments. The ionic environment modifies the general water activity effect.


ISSN: 0009-8558
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 17
Serial Issue: 4
Title: Crystallization of Fe(III)-oxides from ferrihydrite in salt solutions; osmotic and specific ion effects
Affiliation: Escuela tecnica superior ing. agronomos, Cordoba, Spain
Pages: 463-469
Published: 198212
Text Language: English
Summary Language: French
Summary Language: German
Publisher: Mineralogical Society, London, United Kingdom
References: 24
Accession Number: 1984-004670
Categories: Geochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France
Update Code: 1984
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