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}⁻²M glycine with {10}⁻⁵M cupric nitrate and {10}⁻¹M glycine with {10}⁻⁴M 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. © 2000 The Electrochemical Society. All rights reserved.