Details

Autor(en) / Beteiligte

• de Oliveira, Laura Siqueira
• Poles, Ana Paula dos Santos
• Balbino, Marco Antonio
• de Menezes, Matheus Manoel Teles
• de Andrade, José Fernando
• Dockal, Edward Ralph
• Tristão, Heloísa Maria
• de Oliveira, Marcelo Firmino

Titel

Voltammetric determination of cocaine in confiscated samples using a carbon paste electrode modified with different [UO2(X-MeOsalen)(H2O)] · H2O complexes

Ist Teil von

• Sensors (Basel, Switzerland), 2013-06, Vol.13 (6), p.7668-7679

Ort / Verlag

Switzerland: MDPI AG

Erscheinungsjahr

2013

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• A fast and non-destructive voltammetric method to detect cocaine in confiscated samples based on carbon paste electrode modified with methoxy-substituted N,N'-ethylene-bis(salcylideneiminato)uranyl(VI)complexes, [UO2(X-MeOSalen)(H2O)] · H2O, where X corresponds to the positions 3, 4 or 5 of the methoxy group on the aromatic ring, is described. The electrochemical behavior of the modified electrode and the electrochemical detection of cocaine were investigated using cyclic voltammetry. Using 0.1 mol · L(-1) KCl as supporting-electrolyte, a concentration-dependent, well-defined peak current for cocaine at 0.62 V, with an amperometric sensitivity of 6.25 × 104 μA · mol · L(-1) for cocaine concentrations ranging between 1.0 × 10(-7) and 1.3 × 10(-6) mol · L-1 was obtained. Chemical interference studies using lidocaine and procaine were performed. The position of the methoxy group affects the results, with the 3-methoxy derivative being the most sensitive.