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Comparison and classification of the effects of simple ions and molecules upon the transformation of ferrihydrite into more crystalline products
Author(s) -
Cornell Rochelle M.
Publication year - 1987
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.19871500507
Subject(s) - ferrihydrite , goethite , molecule , adsorption , ion , nucleation , chemistry , inorganic chemistry , transformation (genetics) , materials science , organic chemistry , biochemistry , gene
The effects of various simple ions and molecules on the extent and products of the conversion of ferrihydrite into more crystalline products are compared. These ions and molecules can be classified according to how strongly they retard the transformation of ferrihydrite, whether they favour the formation of haematite relative to goethite or whether they retard the formation of goethite more strongly than that of haematite and finally, whether foreign ions can replace a proportion of Fe in the goethite structure. Simple ions and molecules operate through two mechanisms. They adsorb on ferrihydrite and stabilize it and they also act by hindering the nucleation of goethite in solution. Adsorption on ferrihydrite retards the transformation to a far greater extent than does interference in solution.