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 a cobalt(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 of 1.0×10-7 to 1.0×10-1 M, with a comparatively lower detection limit 5.4×10-8 M between pH range of 2.0-10, giving a relatively fast response within ?8 s and can be used for at least 13 weeks without any divergence in potential. The selectivity coefficient was calculated using matched potential method. The electrode can also be used in partially non-aqueous media having up to 20% (v/v) methanol, ethanol or acetone content with no significant change in the value of slope or working concentration range. It was successfully applied for the direct determination of perchlorate content in water and human urine samples.