Abstract
Abstract The application of anodic potential-step stripping voltammetry for the determination of metal ion was investigated. From the dependence of stripping current (ia,d) on electrode radius, the rotational speed of the stirring rod in electrodeposition and electrodeposition time for Cd(II) in 1 M KCl, the diffusion-controlled process could be theoretically predicted. The calibration curves of Cd(II), Mn(II), Ni(II), Zn(II), and Sb(III) were found to be linear in the range 0.01–0.1 ppm, and those of Tl(I), Cu(II), Pb(II), Sn(II), Bi(III), and In(III) in the range 0.02–0.2 ppm, by analysis at time t=1.25 sec on current-time curves. The ratio ia,d⁄ia,p increased in the order n=3<2<1, where ia,d is the anodic diffusion current obtained by the potential-step method, and ia,p the anodic peak current obtained by the linearly varying potential method. The ratio of irreversible electron transfer reaction differed from that of the reversible one. The coefficient of variation in the measurement of peak heights was ±3% for 0.1 ppm or 0.2 ppm of metal ion.
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