Studies on the Voltammetric Behaviors of Rare Earth Ions-Amino Acids

The voltammetric behaviors of rare earth ions-amino acids were studied.The reduction potential of Eu~(3+)was shifted positively and the peak separation of the cathodic and anodic peaks in cyclic voltammogram de-creased when a certain amino acid was added to Eu~(3+) solution.Experimental results showed that Eu~(3+) was re-duced by way of forming complexes with amino acids which were adsorbed on mercury electrode surface.Whenhistidine and formaldehyde existed simultaneously in the solution containing Eu~(3+),a well-defined reversiblecatalytic prewave of Eu~(3+) was obtained.Meanwhile,the reduction current of formaldehyde increased greatlywith the addition of histidine.The mechanism was studied.Several other rare earth ions and amino acids werealso studied preliminarily.