title: A Ho(III) potentiometric polymeric membrane sensor based on a new four dentate neutral ion carrier.
abstract: In this research, we report a new Ho(3+)-PVC membrane electrode based on N-(4,5-dimethyl-2-(picolinamido)phenyl)picolinamide (H(2)Me(2)bpb) as a suitable ion carrier. Poly vinylchloride (PVC)-based membrane composed of H(2)Me(2)bpb 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 ± 0.2 mV decade(-1) over the concentration range of 1.0 × 10(-6) to 1.0 × 1(-2) mol L(-1), and a detection limit of 5.0 × 10(-7) mol L(-1) of Ho(3+) 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 Ho(3+) ions over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. To assess its analytical applicability the proposed Ho(3+) sensor was successfully applied as an indicator electrode in the titration of Ho(3+) ion solutions in certified reference materials, alloy samples and for the determination of the fluoride ion in two mouthwash preparations.
authors.affiliation: Department of Applied Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran. Electronic address: haszamani@yahoo.com.
authors.forename: Hassan Ali
authors.initials: HA
authors.lastname: Zamani
authors.affiliation: Department of Applied Chemistry, Quchan branch, Islamic Azad University, Quchan, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Zanganeh-Asadabadi
authors.affiliation: Department of Applied Chemistry, Quchan branch, Islamic Azad University, Quchan, Iran.
authors.forename: Mitra
authors.initials: M
authors.lastname: Rohani
authors.affiliation: Department of Applied Chemistry, Quchan branch, Islamic Azad University, Quchan, Iran.
authors.forename: Mohammad Saleh
authors.initials: MS
authors.lastname: Zabihi
authors.affiliation: Department of Applied Chemistry, Quchan branch, Islamic Azad University, Quchan, Iran.
authors.forename: Javad
authors.initials: J
authors.lastname: Fadaee
authors.affiliation: Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
authors.affiliation: Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran.
authors.forename: Farnoush
authors.initials: F
authors.lastname: Faridbod
authors.affiliation: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
authors.forename: Soraia
authors.initials: S
authors.lastname: Meghdadi
mesh_terms: D006695:Holmium / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D057230:Limit of Detection; D008567:Membranes, Artificial; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011199:Potentiometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results
chemical_list: D008567:Membranes, Artificial; D011143:Polyvinyl Chloride; D006695:Holmium