Determination of Cocaine by Square Wave Voltammetry with Carbon Paste Electrodes
DOI:
https://doi.org/10.17063/bjfs8(3)y2019149Keywords:
Forensic chemistry, Cocaine, Voltammetry, Carbon paste electrodeAbstract
We compare the electrochemical behavior of cocaine hydrochloride (in acidic medium) and its free base form (in acetonitrile) by a simple, cheap, and fast square wave voltammetry method for cocaine analysis based on carbon paste electrodes without chemical modification. The electrodes performed better than the electrodes obtained for analysis on commercial screen-printed electrodes, which we also tested here. We conducted the analyses in aqueous solution containing 0.1 mol/L NH4ClO4 as supporting electrolyte. For cocaine in acidic medium, the linear correlation coefficient, the LOD, and the LOQ were 0.996, 4.66 10^(-6) mol/L, and 1.55 10^(-5) mol/L, respectively. For cocaine in acetonitrile medium, the linear correlation coefficient, the LOD, and the LOQ were 0.994, 9.77 10^(-6) mol/L, and 3.26 10^(-5) mol/L, respectively. The specificity of the methodology is advantageous when the response of different interfering substances analyzed in this work (lidocaine, procaine, caffeine and phenacetine) is concerned.Downloads
Published
2019-06-04
How to Cite
Pedro Henrique Barros Oliva, Juliana Midori Toia Katayama, Érica Naomi Oiye, Bruno Ferreira, Maria Fernanda Ribeiro, Antônio José Ipólito, … Marcelo Firmino de Oliveira. (2019). Determination of Cocaine by Square Wave Voltammetry with Carbon Paste Electrodes. Brazilian Journal of Forensic Sciences, Medical Law and Bioethics, 8(3), 149–164. https://doi.org/10.17063/bjfs8(3)y2019149
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Artigo Original