Poly(vinyl chloride) membrane containing zirconium(IV)selenomolybdate inorganic ion exchanger as dysprosium(III)ion selective electrode

Abstract

Poly(vinyl chloride) supported tetracycline sorbed zirconium(IV) selenomolybdate chelating inorganic exchange membrane has been employed for the determination of dysprosium(III)

ion. The membrane electrode shows a Nernstain response for Dy(III) over a wide concentration range (l.0×10^-1 <i>M </i>- 5×10^-5 <i>M</i>) with a slope of 18.3 mV per decade of concentration. The detection limit is 3.8×10^-5 <i>M. </i>The electrode is found to possess adequate

stability and specific selectivity for Dy(III) over the other closely trivalent lanthanide metal ions with a response time of ~15 s. The sensor can also be used in partially non-aqueous medium, <i>e.g., </i>acetone/alcohol having 5- 10% (v/v) contents. Its working <i>p</i>H range is 2-9. It is successfully applied for the direct determination of Dy³⁺<i> </i>in meta borate rock and as an indicator electrode in potentiometric titrations of dysprosium ion with 2-4 % experimental error.