Perchlorate Selective PVC Membrane Electrode Based on Cobalt (II) Complex of p-Hydroxy Acetophenone Semicarbazone

A new perchlorate selective poly(vinyl chloride) membrane electrode based on acobalt(ii) complex of p-hydroxyacetophenonesemicarbazone as an ionophore was prepared.the electrode shows nernstian slope of 59.6±0.3 mv/decade with improved linear range of1.0×10-7 to 1.0×10-1 m, with a comparatively lower detection limit 5.4×10-8 m between phrange of 2.0-10, giving a relatively fast response within ?8 s and can be used for at least 13weeks without any divergence in potential. the selectivity coefficient was calculated usingmatched potential method. the electrode can also be used in partially non-aqueous mediahaving up to 20% (v/v) methanol, ethanol or acetone content with no significant change in thevalue of slope or working concentration range. it was successfully applied for the directdetermination of perchlorate content in water and human urine samples.