Determination of Pb(II) by Anodic Stripping Pulse Voltammetry (ASPV) Using Platinum and Glassy Carbon Electrodes

Abstract

Determination of Pb(II) by Anodic Stripping Pulse Voltammetry
(ASPV) in aqueous solutions of 0.01 M CH₃COOH and 0.1 M NaCl
using Rotating Disk platinum Electrode (RDPtE) and Rotating Disk
Glassy Carbon Electrode (RDGCE) has been studied. A number of
supporting types of pulses have been examined and stripping voltammetry
with superimposed constant amplitude pulses of negative
polarity (SVPNP) found to give the greatest sensitivity. The relative
standard deviation is 5.0% at very low concentration of 4 x 10^-6 M.
on RDPtE. The simultaneous discharge-ionization of lead with or
without 5 x 10^-5 M Hg²⁺ has also been studied by SVPNP on
RDGCE. It is shown that the sensitivity increased from 4 x 10^-8 M
without Hg²⁺ to 1 X 10^-10 M with 5 x 10^-5 M Hg²⁺. The relative
standard deviations are 4.4% and 5.9% respectively. This developed
method gives the possibility of determination of Pb(II) on bare
RDPtE. Up to 4 X 10^-6 M, the sensitivity increased from5 x 10^-8 M
in previous works to 1 x 10^-10 M on RDGCE in presence of
5x 10^-5 M Hg²⁺.