Abstract
A PVC membrane electrode for Zn ion based on heterogeneous chelating inorganic ion exchange resin i.e. tetracycline hydrochloride sorbed tin(iv) tungstophosphate is reported. The electrode works well over a wide range of concentration (1.5 x 10 -5 to 1 x 10 -1 M) with a Nernstian slope of 27.3 mV per decade of concentrations. The electrode shows a fast response time of 25 s and operates in the pH range 4-6. The sensor can be used for more than three months without any divergence in the potential. The selectivity of the electrode was studied and was found that the electrode exhibits good selectivity for zinc ions over a wide variety of cations including alkaline earth, transition and heavy metal ions. The zinc ion selectivity electrode was used an indicator electrode for the potentiometric titration of zinc ions in solution against standard EDTA solution. The applicability of the senor to zinc(n) ion measurements in high tensile brass is also illustrated.
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