Abstract
In this work a new type of working electrode for voltammetry – the bi-band silver microelectrode (b-BAgmE) – is presented for the first time. The sensor consists of two Ag bands 25 μm thick and 4.5 mm long. The bands are arranged symmetrically and contrariwise, along the lateral, cylindrical surface of the Ag guide, coated with a thin layer of epoxy resin. Simple and inexpensive microelectrode construction ensures its reliability of use as well as wide possibilities of application in electroanalysis.Electrochemical properties of the sensor were tested by means of the cyclic voltammetry (CV) and the electrochemical impedance spectroscopy (EIS) in the [Ru(NH3)6]2+/3+ redox system. Comparative experiments, carried out simultaneously on a homemade silver annular band electrode (AgABE), commercially available silver microelectrode (AgmE) and b-BAgmE, confirmed occurrence of the microelectrode effect in case of the AgmE and b-BAgmE. Moreover, the b-BAgmE is characterized by significantly lower value of charge-transfer resistance Rct = 179 ± 6 Ω in comparison to AgmE Rct = 6.0 ± 0.4 MΩ.The practical usefulness of the b-BAgmE was confirmed by determination of Pb2+, Tl+, In3+ and vitamin B2 using the differential pulse (DP) voltammetric technique.
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