title: A new selectophore for gadolinium selective sensor.
abstract: Based on a selective complexation of N'-(2-oxo-1,2-di(pyridin-2-yl)ethylidene)furan-2-carbohydrazide (L) with Gd(III) ions, it was used as a selectophore in construction of a Gd(III) selective PVC membrane sensor. Different compositions for the membrane were tested. The o-nitrophenyloctyl ether (NPOE) was used as suitable plasticizer, and a mixture of sodium tetraphenyl borate (NaTPB) and oleic acid (OA) as anion excluders. The proposed sensor displayed a Nernstian behavior with the slope of 19.9 ± 0.6 mV decade(-1) in concentration range of 1.0 × 10(-6) to 1.0 × 10(-2)mol L(-1). Detection limit was 4.2 × 10(-7)molL(-1) and response time was ~10s. Applicable pH range of the electrode was 4.2-8.0. Lifetime of the sensor is at least 10 weeks. Analysis of certified reference materials confirmed the accuracy of the proposed electrode.
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: Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran; Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Farnoush
authors.initials: F
authors.lastname: Faridbod
authors.affiliation: Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran; Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
mesh_terms: D005682:Gadolinium / Q000737:chemistry*; D008567:Membranes, Artificial; D011143:Polyvinyl Chloride / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry
chemical_list: D008567:Membranes, Artificial; D011725:Pyridines; D011143:Polyvinyl Chloride; D005682:Gadolinium
keywords: Gadolinium; Ion selective electrode; New ionophore; PVC membrane; Potentiometry; Sensor