THE EFFECT OF COMPLEX-FORMING AGENT (EDTA) ON THE EXCHANGE OF MANGANESE IONS ON CALCIUM-MONTMORILLONITE - I - REACTION SCHEME AND CALCIUM-MONTMORILLONITE NA(2)EDTA SYSTEM

Authors
KONYA J NAGY NM
Citation
J. Konya et Nm. Nagy, THE EFFECT OF COMPLEX-FORMING AGENT (EDTA) ON THE EXCHANGE OF MANGANESE IONS ON CALCIUM-MONTMORILLONITE - I - REACTION SCHEME AND CALCIUM-MONTMORILLONITE NA(2)EDTA SYSTEM, Colloids and surfaces. A, Physicochemical and engineering aspects, 136(3), 1998, pp. 299-310
Citations number
34
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
136
Issue
3
Year of publication
1998
Pages
299 - 310
Database
ISI
SICI code
0927-7757(1998)136:3<299:TEOCA(>2.0.ZU;2-8
Abstract
The possible reactions in the calcium-montmorillonite-Mn(ClO4)(3)-Na2E DT system are shown. In addition, the effect of EDTA on the distributi on of calcium ions between the surface of montmorillonite and solution s with different pH values and EDTA concentrations is studied. The res ults are interpreted by the principles of Schubert's method for the si multaneous ion exchange and complex-formation reactions. The significa nt role of pH is observed. An expression is deduced which is suitable for the calculation of the ratio between ''free'' calcium ions and tot al calcium concentration of the solution if we know pH, the total conc entration of the complex-forming agent, its pH-dependent a parameter a nd the stability constants of its complexes. (C) 1998 Elsevier Science B.V.