Abstract
In this research, we report a new Ho3+-PVC membrane electrode based on N-(4,5-dimethyl-2-(picolinamido)phenyl)picolinamide (H2Me2bpb) as a suitable ion carrier. Poly vinylchloride (PVC)-based membrane composed of H2Me2bpb with oleic acid (OA) as anionic additives, and o-nitrophenyloctyl ether (NPOE) as plasticized solvent mediator. The sensor exhibits a Nernstian slope of 20.1±0.2mV decade−1 over the concentration range of 1.0×10−6 to 1.0×1−2molL−1, and a detection limit of 5.0×10−7molL−1 of Ho3+ ions. The potentiometric response of the sensor is independent of the solution pH in the range of 3.5–9.4. It has a very short response time, in the whole concentration range (<10s), and can be used for at least eight weeks. The proposed electrode shows a good selectivity towards Ho3+ ions over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. To assess its analytical applicability the proposed Ho3+ sensor was successfully applied as an indicator electrode in the titration of Ho3+ ion solutions in certified reference materials, alloy samples and for the determination of the fluoride ion in two mouthwash preparations.
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