Abstract: | A new PVC membrane electrode for HSO3? anion based on bis‐urea calix4]diquinones I–VI as neutral ionophores is prepared. Of the various membranes prepared, the membrane based on calix4]diquinone III exhibits a linear stable response over a wide concentration range (6.0×10?5?1.0×10?2) with a slope of ?51.5 mV/decade and a detection limit of 2.2×10?6 M. With the exception of HSO3? anion, the remainder of the anions responds based on their hydrophobicity. The membrane revealed improved selectivity coefficients for HSO3? over a wide variety of other anions, and the comparable selectivity for the HSO3?selective membranes is iodide anion. |