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PVC based membrane of Ti(IV) iodovanadate for Pb(II) determination

Mu.Naushad Ghauri

Ti(IV) iodovanadate has been synthesized by mixing a mixture of aqueous solutions of 0.1Msodiumvanadate and 0.1Mpotassiumiodate with 0.1M solution of Ti(IV) chloride at pH 1.0. Distribution coefficients (Kd) of variousmetal ionswere determined on the column of Ti(IV) iodovanadatewhich showed the selectivity of Pb(II) ions by this cation exchange material. So Ti(IV) iodovanadate has been used as an electoactive material for the construction of Pb(II) selective electrode. The main purpose of this study is to develop an inexpensive, simple and reliable ion-selective electrode for Pb(II) determination. The sensor exhibit Nernstian response for Pb(II) ions over a wide concentration range of 110-7Mto 110-1Mwith a slope of 300.4mV per decade of activity. The electrode is suitable for use in aqueous solution in a pH range of 2-7.2 with a response time of 10 second. The membrane electrode can be used at least for 4 months without any divergence in potential. The selectivity coefficients were determined by the mixed solution method and revealed that the electrode was selective for Pb(II) ions in the presence of interfering cations. The sensor could be used as an indicator electrode in the potentiometric titration of Pb(II) ions with EDTA. The practical applicability of the proposed sensor has been reported for Pb(II) determination in a standard rock sample and water sample. The results are found to be in good agreement with those obtained by using conventional methods.