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Iron distribution in the clay fraction of Cambisols as determined by Mössbauer spectroscopy, X‐ray diffractometry and selective dissolution
Author(s) -
Gessa C.,
Melis P.,
Solinas V.,
Micera G.,
Burriesci N.,
Petrera M.
Publication year - 1984
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19841470211
Subject(s) - hematite , goethite , mössbauer spectroscopy , crystallinity , dithionite , dissolution , ferrihydrite , materials science , mineralogy , oxalate , fraction (chemistry) , analytical chemistry (journal) , chemical composition , chemistry , inorganic chemistry , crystallography , environmental chemistry , biochemistry , enzyme , organic chemistry , adsorption
Iron forms which characterize the clay fraction of four Cambisols from granite and the distribution of iron oxides in the soil profiles are studied by Mössbauer spectroscopy, X‐ray diffractometry and selected chemical methods. The results obtained show that about 50 % of the Fe t (6–10 % Fe) is not extracted by dithionite. The Fe o /Fe d ranges between 0.15 and 0.35. Oxalate dissolves goethite in different amounts, probably depending on the particle size and the Al‐substitution level. The highest amount of hematite is found in the samples characterized by the lowest internal magnetic fields, suggesting that the soil distribution of hematite and goethite is related to environmental factors favouring or disfavouring Al‐for‐Fe substitution and crystallinity of the oxides.