Potentiometric Studies on Lanthanide(III) Mixed-ligand Complexes in Aqueous Solution

School of Studies in Chemistry,Jiwaji University, Gwalior-474 011 Manuscript received 22 April 1991, accepted 6 December 1991 Several mixed ligand complexing systems of the type 1 : 1 : 1 MAB (where M =LaIII, PrIll, Ndlll and SmllI; A=disodium salt of ethyleneglycol bis(2-amino- ethylether)tetraacetic acid (EGTA) , B= alanine or phenylalanine) have been studied potentiometrically Thermodynamic equilibrium constants have been evaluated along with the parameters ΔGº, ΔHº and ΔSº