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Potentiometric study of multimetal-multiligand complexes of toxic metals Hg(II), Pb(II) and Cd(II) with two different ligands amino acid acts as a neurotransmitter or neuromodulator 2-aminosuccinic acid (2-ASA) and pyramidine base 5-methyluracil (5-MU) at silver-silver chloride electrode forming the binary, ternary and quaternary complexes having great significance for living beings. The protonation constants, stability constants, titration curves and speciation curves were studied by using special computer programme SCOGS and ORIGIN which gives correct and accurate percentage information of the complex formation.

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