COATED WIRE HYAMINE 1622-SELECTIVE ELECTRODES BASED ON DIBENZO-18-CROWN-6 AND DIBENZO-24-CROWN-8

Coated wire ion-selective electrodes ( CWISEs ) for the Hyamine 1622 cation (Hy) based on dibenzo-18-crown-6 (DB18C6 ) and dibenzo-24-crown-8 ( DB24C8 ) are developed. Both electrode systems exhibit stable near Nernstian response over the range 10(-3) - 10(-6) mole l-1Hyamine 1622 cation with a slope in the range of 56-59 mv/ decade of concentration. The working pH range is 3-9 and the response time varies from 30 to 50 s. The selectivity toward Hyamine 1622 cation is reasonably high relative to many common inorganic cations and organic cations not having surfactant properties. The electrode was suitable for determining the critical micelle concentration and as end-point detector in the potentiometric titration of the cationic surfactants.