BISMUTH OXIDE – MODIFIED ELECTRODE FOR DETERMINATION OF METAL TRACES BY ANODIC STRIPPING VOLTAMMETRY

Abstract

    A new chemically modified electrode was constructed for accurate, selective and sensitive simultaneous determination of  cadmium (Cd) and indium (In) by anodic stripping voltammetry (ASV). The electrode was prepared by multi-walled carbon nanotubes (58%), parafin oil (35%)  and Bi2O3 (7%) in carbon  paste electrode. The linear range between 8.9x10-9M to 1.33x10-7M  for Cd and 4.34x10-8M to 2.17x10-7M for In. The 3δ determination limit is 1.07x10-9M for Cd and 1.04x10-8M  for In with suitable conditions (buffer acetate and  KBr 0.1 M, pH = 4.5, deposition at -1.2V for 180s). The proposed chemically modified electrode was used for the determination of cadmium and indium in several water samples.