Studies on the polythiophene(PT)/GC electrode for the determination of some metals by differential pulse anodic stripping voltammetry (DPASV)

Studies were carried out on the fabrication of glassy carbon electrode modi fied with polythiophene (PT/GC). Cu(II), Pb(II), Cd(II), and Zn(II) were de termined by using the PT/GC modified electrode by DPASV. The PT/GC electrod e was easily fabricated by cyclic voltammetry applying the potential from - 0.5 V to +1.8 V (vs. SCE) at the scan rate of 50 mV/sec in 0.1 M thiophene -1 M tetrabutylammonium perchlorate (TBAP)-acetonitrile mixture. The thickn ess of the polymer film could be controlled by the number of potential cycl ing. PT/GC electrode showed Cu oxidation peak at 0.1 V vs. SCE, which is mo re positive potential than DME (at -0.1 V). The calibration graph for the C u(II) was linear from 10 ppb to 450 ppb with correlation factor of 0.99. An odic oxidation peaks of Pb, Cd, and Zn were observed at -0.5 V, -0.7 V, and -1.2 V vs. SCE, respectively. The PT/GC modified electrode could replace t he conventional mercury electrode for the voltammetric study.