期刊名称：Brazilian Journal of Forensic Sciences, Medical Law and Bioethics
电子版ISSN：2237-261X
出版年度：2019
卷号：8
期号：3
页码：149-164
DOI：10.17063/bjfs8(3)y2019149
出版社：Instituto Paulista de Estudos Bioéticos e Jurídicos
摘要：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.
