STUDY OF IRON (III) SENSOR BASED ON CHALCOGENIDE GLASS

This paper presents a preliminary structural and electrochemical study of the iron chalcogenide glass Fe-selective electrode using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical characterization of a chalcogenide based iron membrane was achieved by means of a direct potentiometric measurement. We used differential scanning calorimetry (DSC) analysis to check the calorimetric evolution of the as-quenched specimens under a continuous heating. Sensor response versus Fe3+ has been examined, and a response mechanism is proposed. Studied sensor exhibits a slope of 30 mV/decade in a large range of primary ion concentration. The electrode has a short response time and has a good selectivity towards a lot of foreign species. The sensor was used for a period of one month without significant shift of potential electrode. The results of this study have provided a response mechanism involving a combination of charge transfer and ion-exchange of Fe3+ species.