Jm. Zen et al., Selective voltammetric determination of lead(II) on partially quaternized poly(4-vinylpyridine)/mercury film electrodes, ELECTROANAL, 11(2), 1999, pp. 108-113
A partially quaternized poly(4-vinylpyridine) mercury film electrode (QPVP/
MFE) was developed for the determination of traces of Pb(II) in real sample
s by square-wave anodic stripping voltammetry. In this method, Pb(II) is co
nverted into an anionic chloride complex and preconcentrated into the QPVP/
MFE by applying a potential of -1.2V(vs. Ag/AgCl). Good solubility of lead
in mercury subsequently helps to increase the preconcentration effect. Vari
ous factors influencing the determination of Pb(II) were thoroughly investi
gated in this study. The main advantages of this method are a wide pH worki
ng range, good resistance to interference, easy detection without deoxygena
ting, and excellent electrode renewal. The analytical utility of the QPVP/M
FE in the determination of Pb(II) is demonstrated by application to various
water samples.