Abstract

Shamim Shaukat Khan

DOI : http://dx.doi.org/10.13005/ojc/360616

A comprehensive spectrophotometric study is undertaken for ternary complexes of higher rare earth element Erbium with EDTA, HEDTA, CYDTA and EGTA as primary ligand and the binary ligands used are maltol, tiron, kojic acid and α -picolinic acid. The ternary complexes showed hyperchromic effect as compare to primary complexes is exploited to determine the stoichiometry of ternary complexes and their stability constants were computed. Also order of stabilities with respect to various secondary ligands is established for different Erbium-primary ligand systems. The study is useful in the micro determination of higher rare earth elements like Erbium.

Molar Extinction Coefficients; Molar Ratio And Absorbance; Primary Complex; Secondary Complex; Stability Constant; Ternary Complexes

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