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A comprehensive spectrophotometric study is undertaken for ternary complexes of higher rare earth element Erbium with ethylene diamine tetra acetic acid ( EDTA), hydroxyl ethylene diamine triacetic acid (HEDTA), trans 1, 2, cyclohexane diamine tetra acetic acid (CYDTA) and ethylene glycol bis (2-amino ethylene) N,N1,N11,N1 1 1 tetra acetic acid (EGTA) as primary ligand and the binary ligands used are Maltol, Tiron, Kojic acid and α-Picolinic acid. The ternary complexes shows hyperchromic effect as compare to primary complexes which is exploited to determine the stoichiometry of ternary complexes and it is found to be 1:1:1. The conditional stability constants (Ks 1) are corrected using k H values of ligands. The order of stability with the series of ligands in different systems is deduced as EDTA and HEDTA: α Picolinic acid >Tiron> Kojic acid > Maltol and CYDTA and EGTA: α Picolinic acid > Kojic acid > Tiron > Maltol. The % increase in molar coefficients of mixed ligand complexes of Erbium is significant which can facilitates the analytical measurements for its micro determination. keywords: Ternary complexes, Molar extinction coefficients, Primary complex, Erbium, Stability constant, Molar ratio and absorbance.

Spectrophotometric Studies of Ternary Complexes of Erbium to Explore the Hyperchromic Effect with Various Ligands and their use in Microdetermination