New potentiometric sensor for the determination of iodine species

► Triiodide potentiometric sensor based on an ion-pair of Rhodamine B triiodide as a membrane carrier ► The electrode has a linear dynamic range between 1 × 10− 6 and 1 × 10− 1 M. ► The Nernstian slope of 68 ± 1 mV pC− 1 and detection limit of 3.9 × 10− 7 M ► Indicator electrode in potentiometric determination of some iodine species