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The electrochemical measurements were carried out at roomtemperature (25 ◦C) applying square wave voltammetric technique(potential scan increment: 5 mV; amplitude: 50 mV; frequency:30 Hz), using a CH Instruments model 440 B electrochemical analyzer(CH Instruments Inc., USA). The preliminary experimentsinvolving Sensor 1 were performed in 5 mL electrolysis microcell,model K 0264 (EG&G PARC, USA) properly modified, containing Ptcounter electrode and Ag, AgCl reference electrode. The determinationsinvolving the modified screen printed electrode (Sensor 2)were carried out directly, after spreading of a 30 L drop of theanalyte on its working area.
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