Bismuth Modified Gold Microelectrode for Pb(II) Determination in Wine Using Alkaline Medium |
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Authors: | Maiara Oliveira Salles Ana Paula Ruas de Souza Juliana Naozuka Pedro Vitoriano de Oliveira Mauro Bertotti |
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Institution: | Instituto de Química, Universidade de S?o Paulo, S?o Paulo, SP, Brasil |
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Abstract: | Electrodeposition of bismuth on gold microelectrodes for determination of Pb(II) by square wave anodic stripping voltammetry (SWASV) was accomplished by an in situ procedure in alkaline solution. A linear calibration plot for Pb(II) in the concentration range 40 to 6700 nmol L?1 (r=0.998) was obtained, the detection limit was found to be 12.5 nmol L?1 (S/N=3) and the relative standard deviation in solutions containing 1 μmol L?1 Pb(II) was 4% (n=12). The analytical performance of the proposed sensor was tested by measuring the Pb(II) concentration in a wine sample. The result was in good agreement with the one obtained by GFAAS. |
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Keywords: | Bismuth Gold microelectrode Lead Wine Thin films |
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