Abstract
The worldwide attention for illicit drug consumption is known, mainly cocaine and marijuana, which were the most commonly apprehended drugs. In this study, we adapted conventional systems for voltammetric analysis for identifying these drugs using screen-printed electrode (SPE) devices in a portable potentiostat. For cocaine determination, a commercial platinum screen-printed electrode (Pt-SPE) with a cobalt hexacyanoferrate film (CoHCFe) presented the best results in comparison to other available models, and for Δ9-tetrahydrocannabinol (Δ9-THC), no chemical modification was required on the carbon screen-printed electrodes (C-SPEs). The results allowed the use of the adapted systems with good analytical parameters: cocaine and Δ9-THC determination presented a sensibility equal to 2.02 × 10−2 and 2.65 × 10−7 A L mol−1 , respectively. Finally, the developed procedures showed an application for electrochemical analysis in forensic context, besides the results obtained to comply with reliable results which forensic analysis must have.
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Acknowledgments
The authors acknowledge Polícia Científica do Estado de São Paulo (SPTC-SP) for the partnership, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Proccess 2012/00084-7), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES – 3451/2014) for the financial support.
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Balbino, M.A., Oiye, É.N., Ribeiro, M.F.M. et al. Use of screen-printed electrodes for quantification of cocaine and Δ9-THC: adaptions to portable systems for forensic purposes. J Solid State Electrochem 20, 2435–2443 (2016). https://doi.org/10.1007/s10008-016-3145-3
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DOI: https://doi.org/10.1007/s10008-016-3145-3