Potential-pH equilibria and potentiodynamic polarization studies were used
to examine the electrochemical behavior of copper in aqueous glycine soluti
ons. Potential-pH diagrams for the copper-water-glycine system were derived
at different total copper {Cu-T} and glycine {L-T} activities. The diagram
s show that glycine significantly extended the solubility range of copper.
Polarization experiments were conducted in deaerated and aerated aqueous so
lutions of 10(-2) M glycine with 10(-5) M cupric nitrate and 10(-1) M glyci
ne 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 di
agrams. Good correlations were observed. (C) 2000 The Electrochemical Socie
ty. All rights reserved.