Electrochemistry of copper in aqueous glycine solutions

Potential-pH equilibria and potentiodynamic polarization studies were used to examine the electrochemical behavior of copper in aqueous glycine solutions. Potential-pH diagrams for the copper-water-glycine system were derived at different total copper {Cu-T} and glycine {L-T} activities. The diagrams show that glycine significantly extended the solubility range of copper. Polarization experiments were conducted in deaerated and aerated aqueous solutions of 10(-2) M glycine with 10(-5) M cupric nitrate and 10(-1) M glycine with 10(-4) M cupric nitrate at pH values between 9 and 12. The results of these experiments are discussed in terms of the relevant potential-pH diagrams. Good correlations were observed. (C) 2000 The Electrochemical Society. All rights reserved.