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Voltammetric analysis of cocaine using platinum and glassy carbon electrodes chemically modified with Uranyl Schiff base films

2013; Elsevier BV; Volume: 110; Linguagem: Inglês

10.1016/j.microc.2013.04.017

1095-9149

Laura Siqueira de Oliveira, Marco Antônio Balbino, Matheus Manoel Teles de Menezes, Edward R. Dockal, Marcelo Firmino de Oliveira,

Electrochemical Analysis and Applications

Platinum and glassy carbon electrodes chemically modified with films of Schiff bases of [UO2(3-MeOSalen)(H2O)] · H2O and [UO2(5-MeOSalen)(H2O)] · H2O, to determine cocaine were developed. The stability of these films in aqueous solution containing 1.0 mol L− 1 KCl and HCl 1.0 mM in pH 3 as supporting electrolyte and conducted cyclic voltammetric analysis of cocaine in the same supporting electrolyte were investigated. A reversible interaction between cocaine and the working electrodes increased the original peak current of the surface-modifier, according to the employed species. The determination of cocaine using the developed electrodes depended linearly on cocaine concentration in the range 0.54–9.10 μmol L− 1, with amperometric sensitivities of 5.21 × 107 and 1.66 × 105 μA mol− 1 L, limits of quantification of 0.29 and 0.50 μmol L− 1, and limits of detection of 0.07 and 0.15 μmol L− 1, respectively.