ELECTROCHEMICAL DETERMINATION OF AG(I) AND CU(II) USING ACTIVATED CARBON-PASTE ELECTRODES

An electroanalytical method for Cu (II) and Ag (I) quantification is d escribed. The determination was performed by cyclic voltammetry on a s upporting electrolyte with a previous step of cations accumulation by electrodeposition at constant potential. Linear dependence between the anodic current peaks and the bulk concentration of both cations were obtained: the concentration ranging from 5.0 x 10(-8) M to 2.0 x 10(-5 ) M for copper and from 5.0 x 10(-9) M to 4.0 x 10(-5) M for silver. N o interferences of Zn (II), Mn (II), Cr (III), Pb (II) and Ni (II) wer e observed. The method here proposed offers a reliable, sensitive and practical way to determine copper and silver.