Pb2+ potentiometric chemical sensors based on lead and silver doped thioaresenate glasses
Résumé
Lead doped chalcogenide glass compositions, in the pseudo-ternary AgI-PbS-As2S3, were examined as active
membrane materials for the construction of Pb(II) ion-selective sensors, Pb(II) ISE. The basic glass properties of
the synthesised bulk samples such as vitreous state, macroscopic, thermal and electric properties were studied.
To this end, several techniques were used, including X-ray powder diffraction, density measurements, differential
scanning calorimetry, scanning electron microscopy and impedance complex spectroscopy. It is found that the
density increases with increased AgI and PbS contents. The glass transition temperatures for the studied com-
positions were also reported. The electrical measurement show the conductivity increases with increasing AgI
content. Meanwhile, for the glasses with same AgI content and increasing PbS content, the conductivity de-
creases. For the fabricated sensors, several key analytical parameters were investigated to evaluate the different
glass compositions as active membranes in Pb(II) ISE, including detection limit, sensitivity, linearity, ionic
selectivity (in the presence of K+, Na+, Ni2+, Ca2+, Cd2+, Cu2+ and Hg2+ interfering cations), reproducibility and
optimal pH-range
Domaines
Physique [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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