Fast procedure for lead determination in alcoholic beverages

In this paper, the system based on Bismuth Film Electrodes BiFEs combined with rotating disk electrode (RDE) was applied to determine lead in beer samples. Lead and bismuth were simultaneously deposited by reduction at -1V on a rotating carbon-paste disk electrode. Then, the preconcentrated metals were oxidized by scanning the potential of the electrode from -1 to -0.4V using a square-wave waveform. The electrode displayed excellent linear behavior in the examined concentration range, from 5 to 85 ^g.L"1 lead (r2=0.998). Finally, the proposed method (Square-Wave Anodic Striping Voltammetry (SWASV)) was applied for determination of lead in beer. Beer samples were digested with dry ashing and wet ashing procedures. The wet ashing procedure was chosen for the digestion of all the beer samples because it required shorter time. The present results were validated by Inductively Coupled Plasma Atomic Emission Spectroscopy ICP-AES.