Polarographic study of the substitution reactions of the chelates of triethyl-enetetraminehexa-acetic acid-I Reaction of the zinc chelate with calcium ions.
The mechanism of the substitution reaction between the binuclear zinc-triethylenetetraminehexa-acetic acid (TTHA) chelate (Zn(2)X(2-)) and calcium ions was studied by the polarographic technique. The results obtained under equilibrium and kinetic conditions permitted formulation of the reaction mechanisms as depending on the ratio Zn:Ca in the system studied. The reaction studied proceeds only in the presence of ammonia. When calcium is replaced with a metal which has a TTHA chelate more stable than Zn(2)X(2-), the mixed binuclear chelate is not formed.
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Heyrovsky Polarographic Institute, Czechoslovak Academy of Sciences, Prague, Czechoslovakia.