Abrasively Immobilized Multiwall Carbon Nanotubes Bismuth Film Electrode For Chronopotentiometric Stripping Analysis Of Tin

A sensitive chronopotentiometric stripping method for determination of trace tin was first developed using the novel abrasive immobilized MWCNTs and in-situ plated bismuth film electrode. The result showed that this environment-friendly electrode was stability and much easy to prepare. The effects of pH of acetate buffer, concentration of Bi(III) and cetyltrimethyl ammonium bromide, deposition potential, accumulation time, stripping current and possible interferences were investigated in detail. Through the synergistic sensitization effect of MWCNTs and bismuth film, the fabricated electrode showed sensitive response with a well-defined peak to Sn(IV). Under the optimal conditions, the electrode exhibited linear ranges from 2.0 to 100.0 mu g/L with a detection limit as low as 0.06 mu g/L for tin. Good resolution between neighbouring Sn(IV) and Pb(II) signals was obtained in the presence of oxalic acid. The electrode was applied to detect trace tin in canned food with an average recovery between 94.6 and 106.6%.