Abstract
A new electrochemical multisensor was developed designed and constructed, which is suitable for analysis of small solution volumes (5-200 |iL). This multisensor is composed of an array of small sensors - 8 solid working electrodes: 4 different non?toxic solid amalgam electrodes [1, 2], a copper, a gold, a platinum and a glassy carbon electrode. Moreover, solid amalgam composite electrodes can be built-in . The prototype of the tested multisensors contained the following minielectrodes: m-AgSAE (disk diameter 0 0.8 mm), MF-AgSAE (0 0.8 mm), p-AgSAE (0 0.8 mm), copper (CuE; 0 0.6 mm), m-CuSAE (0 0.8 mm), gold (AuE; 0 0.4 mm), platinum (PtE; 0 0.6 mm) and glassy carbon (GCE; 0 2.0 mm), and one platinum auxiliary electrode (0 0.8 mm). The array has the shape of a Teflon disc of 8-mm diameter. The working electrodes were situated on the circumference of the disc, and a platinum electrode, used as an auxiliary electrode common for all working electrodes, was placed in the centre of the disc. Calomel reference electrode based on silver solid amalgam was prepared in a disc-shaped plug to cover the sensor compartment. The newly developed multisensor is especially suitable for fast finding of the most suitable working electrode for a particular determination and for simultaneous obtaining of information from 8 different electrodes which can greatly increase the information content obtained from a single voltammetric run.
Author(s): Ji i Barek, Tomas Navratil, Bogdan Yosypchuk, Miroslav Fojta