Highly selective chloride poly(vinyl chloride) membrane electrode based on vanadium(IV) oxide acetylacetonate

Abstract

The response characteristics &nbsp;of a new solvent-polymeric membrane electrode with unique selectivity and detection limit towards chloride anion is reported here. The electrode is prepared by incorporating vanadium(IV) oxide acetylacetonate into a plasticized PVC-membrane. The resulting sensor exhibits high selectivity for chloride anion over other anions, including lipophilic inorganic anions like nitrate and perchlorate, etc. The electrode has a linear dynamic range 2.5×10^-5-1.0×10^-1 <i>M </i>with a Nernstian slope -55.0±2 mV per decade and a low detection limit 4.27×10^-6 <i>M. </i>The potentiometric response has been found to be

independent of <i>p</i>H of the solution in the <i>p</i>H range 3.5-9.0. The electrode can be used for at least 9 months without any considerable divergence in its potential. It can be used as an

indicator electrode in the potentiometric titration of silver ions.