RT Journal Article
SR Electronic
T1 Oxidation of Ferrous Iron in Vermiculite and Biotite Alters Fixation and Replaceability of Potassium
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1401
OP 1402
DO 10.1126/science.162.3860.1401
VO 162
IS 3860
A1 Barshad, Isaac
A1 Kishk, Fawzy M.
YR 1968
UL http://science.sciencemag.org/content/162/3860/1401.abstract
AB Oxidation of octahedral ferrous to ferric iron in soil vermiculite clays and biotites increases the potassium-fixation capacity of vermiculites and increases the difficulty of replacing interlayer potassium in biotites. This unexpected effect is believed to be related to an increase in the attractive forces between potassium ions and oxygen ions of the surface layers which is brought about by a tilting of the dipole of the octahedral hydroxyl ions from a perpendicular position to an inclined position with respect to the cleavage plane.