Dysprosium selective potentiometric membrane sensor

A novel Dy(III) ion-selective PVC membrane sensor was made using a new synthesized organic compound, 3,4-diamino-N′-((pyridin-2-yl)methylene)benzohydrazide (L) as an excellent sensing element. The electrode showed a Nernstian slope of 19.8 ± 0.6 mV per decade in a wide concentration range of 1.0 × 10−6–1.0 × 10−2 mol L−1, a detection limit of 5.5 × 10−7 mol L−1, a short conditioning time, a fast response time (< 10 s), and high selectivity towards Dy(III) ion in contrast to other cations. The proposed sensor was successfully used as an indicator electrode in the potentiometric titration of Dy(III) ions with EDTA. The membrane sensor was also applied to the F– ion indirect determination of some mouth washing solutions and to the Dy3+ determination in binary mixtures. Highlights: ► The novelty of this work is based on the high affinity of the ionophore toward the Dy3+ ions. ► This technique is very simple, fast and inexpensive and it is not necessary to use sophisticated equipment. ► The newly developed sensor is superior to the formerly reported Dy3+ sensors in terms of selectivity.