The catalytic effect of Ag+ and Cu++ on the anodic dissolution of ZnS conce
ntrate has been studied in H2SO4 medium. It has been observed through cycli
c voltammetry that in both cases the current for Zn dissolution increases w
ith added cation concentration and also the additional peaks indicate the f
ormation of Ag2S/CuS and Ag/Cu metal. Cu++ in HCl solution does not either
show catalytic effect or the formation of of CuS. Moreover, the metallic co
pper formation is also found to be less.