oa Agrochemophysica - The displaceability of specifically adsorbed copper from clay minerals

Volume 3, Issue 2
  • ISSN : 0302-7112



The displaceability of specifically adsorbed copper from kaolinite and montmorillonite is determined by the size of the displacing ion. Ions with approximately the same size as the Cu-ion eg. Co++ were the most successful displacers of Cu++. Cu++ is presumably partly adsorbed in the clay structure of the minerals viz. the Si-tetrahedral layer. Due to the natural rotation of the tetrahedra, the size of the holes can be reduced up to one third, which will favour the possibility of adsorption of copper in this position. A part of the copper is probably also adsorbed due to exchange with weakly dissociated H-ions, thereby explaining the reduction in pH which occurred in some cases when copper was adsorbed.

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