Aplica??es eletroanalíticas com eletrodos de prata confeccionados a partir de CDs graváveis

摘要

This paper presents a new way for the construction of silver electrodes utilizing recordable CDs. The new electrodes were explored for the quantification of chloride (by potentiometry/FIA), cyanide (by amperometry/FIA) and for lead analysis (by square wave voltammetry). For the flowing measurements, a digital multimeter, connected to a microcomputer (via RS 232 interface) was used to collect directly the potential signal (for Cl- measurements) or to take the output signal from a potentiostat (for CN- measurements). The square wave voltammetry analysis was performed in a commercial instrument. The results shown good performance of the new electrodes and the detection limit (s = 3) attained for these three analytes were: 0.2, 50, and 200 μg L-1 for Pb2+, Cl-, and CN- respectively.