A bromide ion-selective polymeric membrane electrode based on a benzo-derivative xanthenium bromide salt

A novel bromide ion-selective PVC membrane sensor based on 14-phenyldibenzo [a]xanthenium bromide as a membrane carrier was prepared. The electrode has a linear dynamic range between 1.0x10(-1) and 3.2x 10(-5) M with a near-Nernstian slope of 61+/-1 mV per decade and a detection limit of 2.0x10(-5) M. The potentiometric response is independent of the pH of the solution in the pH range 4.5-8.5. The electrode possesses the advantages of low resistance, fast response and good selectivities over a variety of other anions. It was applied as an indicator electrode in potentiometric titration of bromide ions. (C) 2000 Elsevier Science B.V All rights reserved.