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The present investigation focused on analytical application of heteropolyacid salt named Titanium (IV) molybdotungstate [TiMoW] synthesized at pH 1.0. The characterized material having 0.98 meq/g ion exchange capacity was fabricated in the form of Y(III) selective electrode using epoxy resin as a binder. The best performance was exhibited by the membrane having composition: Titanium [IV] molybdotungstate (40%) and epoxy resin (60%). The membrane worked well over a wide range of conc. (1.0×10-5 to 1.0×10-1 M) of Y (III) ion with an over-Nernstian slope of 33.7 mV/decade. The response time exhibited by the sensor was only 5 seconds. The effect of internal solution and partially non-aqueous media on the working of electrodes has been studied.
FIM and MPM have been used for determining selectivity coefficient value with respect to different metal ions. A stable potential behavior for TiMoW based electrode was recorded in the pH range of 4.61-10.65 for 10-3 M Y (III) ion concentration. The sensor has been applied analytically as indicator electrode in the potentiometric titration of Y (III) ion against EDTA and for the estimation of Y (III) ion in the test sample. The results have been compared with those obtained from ICPMS study.