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The characterization, construction and performance characteristics of a novel sensor have been carried out. With this purpo se, an accurate characterization of the mineral has been performed using scanning electron microscopy (SEM/EDX), X-ray spectrometer and potentiometry. The elemental compo sition of the sample has been obtained by X-ray microanalysis. The main compounds of the mineral are a pyrite and a pyrrhotite. The potentiometric analysis has allowed investigating some properties of the pyrite/pyrrhotite mineral as a potential sensor material. This techni que has also been useful to investigate possibility of using this min eral as indicator electrode for redox determination in aqueous solution. The sensor based on pyrite/pyrrhotite mineral as an electroactive material, displays a stable, reproduc ible and linear response for iron(III) over concentration range of 10 −10 mol/L with non-Nernstian slope of 38.7 ± 0.6 mV per decade. The response time was 10 s. The propose d sensor was applied to determine cobalt(II) and the results were compared with that of a platinum electrode. The determination of 2 mg of cobalt(II) shows an averag recovery of 100.9%. The relative standard deviation of this method was 0.5%.

Pyrite/pyrrhotite mineral based electrochemical sensor for redox determination in aqueous media