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Differenzierung oxalatlöslicher Eisenoxide
Author(s) -
Fischer W. R.
Publication year - 1976
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.19761390512
Subject(s) - dissolution , oxalate , chemistry , podzol , decomposition , ferrous , ferric , inorganic chemistry , hydrolysis , nuclear chemistry , soil water , geology , organic chemistry , soil science
Differentiation of oxalate soluble iron oxides According to their mode of formation the oxalate soluble Fe(III)‐oxides show different rates of dissolution especially within the first 30 min of oxalate extraction. Precipitates formed by bacterial or oxidative decomposition of ferric citrate have a very high dissolution rate with more than 90 percent being dissolved within 30 min. Ferrihydrites prepared by alkaline hydrolysis of Fe(III) salts, after slow drying, dissolve to about 60 to 80 percent within this period, whereas similar products quenched with liquid N 2 dissolve more rapidly. A plot of (Fe 30 /Fe o ) vs. (Fe o /Fe d ) allows to draw a boundary line between the field of podzol values and the field of the other pedogenic iron oxides, as from brown earths and black earths (chernozems).