STUDY ON DETERMINATION OF ZINC TRACE BY ANODIC STRIPPING VOLTAMMETRY WITH BISMUTH FILM ON PASTE NANO CACBON ELECTRODE

Abstract

    A bismuth film plated in situ at a nano carbon paste support was tested as a novel. This newelectrode was used for determination of zinc (Zn) traces in an acetate buffer (pH = 4.5). Themetal ions and bismuth were simultanously deposited by reduction at Edep -1.4V. Interferenceof the factors such as supporting electrolytes, Bi3+ concentration, deposition potential (Edep),deposition time (tdep), sensitivity, limit of detection (LOD) on stripping of tin wereinvestigated. Under suitable conditions ( buffer acetate pH = 4.5, deposition at -1.4V for120s), the 3σ detection limit is 0.5ppb for Zn2+ (R = 0,994). Finally, BiF/NCPE's weresuccessfully applied to the determination of Zn in the seawater samples.