Application of Ag-Ge-Se based chalcogenide glasses on ion-selective electrodes

CONDE GARRIDO, J. M.; MACORETTA, F.; MARIA ANDREA UREÑA; ARCONDO, B.

Montpellier, Francia

Simposio; 16th International Symposium on Non oxide and New Optical Glasses (ISNOG 2008); 2008

ICG Montpellier

Chalcogenide glasses (ChG) have proven to be promissory materials for their application as sensitive membranes in ion selective electrodes (ISE), which are used in electrochemical sensors in order to detect heavy metal ions in solutions. The AgGeSe system is not an exception.The ChG system Agx(Ge0.25Se0.75)100-x with x between 10 and 25 at.% was investigated as membrane material in ion selective electrodes. This system has shown sensibility to the presence of Cu(II) and Fe(III) ions. The introduction of cooper or iron to the ChG composition was made in order to improve the selectivity of the Cu(II)-ISE and Fe(III)-ISE. The analytical properties such as reproducibility, linear range, sensibility, detection limit, response time and working pH range were studied with respect to the ChG composition for the three systems. The cross-selectivity of some interfering ions was investigated.