Mixed ligand 1:1:1 chelates of Th(IV) and Zr(IV) containing EDTA as primary ligand and amino acids such as aspartic acid and glutamic acid as secondary ligands, have been studied potentiometrically, and their stability constants log KMLA are reported. The mixed complexes formed are [Th(EDTA)A]2- and [Zr(EDTA)(OH)A]3- respectively (where A = aspartate or glutamate anions) and Th(IV) forms stronger chelates than Zr(IV).
M N SRIVASTAVA ,M K SINGH ,A K SAXENA ,R C TIWARI ,
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