Ion-Selective Electrodes Responsive to Maleic and Phthalic Acids

The electrode membranes responsive to maleic and phthalic acids were prepared by using the organic solvent solutions of the crystal violet salts of the corresponding organic anions. The responses of both the electrodes are linear down to 10−4 – 10−4.5 M, with an ideal Nernstian slope of 58 mV per activity decade at 20 °C.