The mechanism involved in electroreduction of citrate complexes of cop
per(II) is analyzed in the pH interval from 3.5 to 11 using the techni
que of isopotential solutions and polarization resistances determined
under forced convection. In acidic media, the CuLH(-) species is the p
revailing electroactive complex; in alkaline media, it is the CuL(2-)
complex that predominantly discharges.