Analysis of heavy metals in ecstasy tablets by electrochemical methods |
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Authors: | Inmaculada Fierro Rafael Pardo Mariluz Tascón Dolores Vázquez |
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Institution: | Facultad de Ciencias , Departamento de Química Analítica, Universidad de Valladolid, 47005, Valladolid, Spain |
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Abstract: | Trace amounts of heavy metals have been analysed by electrochemical techniques in ecstasy tablets obtained from different police seizures in Spain. Lead, cadmium, copper and zinc were determined by differential-pulse anodic stripping voltammetry at a hanging mercury drop electrode, whereas nickel and cobalt were determined by adsorptive differential-pulse cathodic stripping voltammetry from their dimethylglyoxime complexes, M(DMG)2. The performance of the procedure was compared with electrothermal atomic absorption spectrometry. The procedure was applied to the determination of these elements in nine ecstasy samples, finding that Zn is the element present in the highest concentration, ranging from 0.3 to 200?mg?kg?1, Ni, Cu appear below 15?mg?kg?1 and Pb below 8?mg?kg?1, while Cd and Co levels were always lower than 0.51?mg?kg?1. |
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Keywords: | Ecstasy (3 4-methylenedioxymethamphetamine) MDMA heavy metals stripping voltammetry electrothermal atomic absorption spectrometry |
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