Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7643872 | Microchemical Journal | 2013 | 22 Pages |
Abstract
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 Lâ 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 Lâ 1, with amperometric sensitivities of 5.21 Ã 107 and 1.66 Ã 105 μA molâ 1 L, limits of quantification of 0.29 and 0.50 μmol Lâ 1, and limits of detection of 0.07 and 0.15 μmol Lâ 1, respectively.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Laura Siqueira de Oliveira, Marco Antonio Balbino, Matheus Manoel Teles de Menezes, Edward Ralph Dockal, Marcelo Firmino de Oliveira,