title: A fast response hafnium selective polymeric membrane electrode based on N,N'-bis(alpha-methyl-salicylidene)-dipropylenetriamine as a neutral carrier.
abstract: In this study a new hafnium selective sensor was fabricated from polyvinylchloride (PVC) matrix membrane containing neutral carrier N,N'-bis(alpha-methyl-salicylidene)-dipropylenetriamine (Mesaldpt) as a new ionophore, sodium tetraphenyl borate (NaTPB) as anionic discriminator and dioctyl phthalate (DOP) as plasticizing solvent mediator in tetrahydrofuran solvent. The electrode exhibits Nernstian response for Hf(4+) (Hafnium(IV)) over a wide concentration range (2.0 x 10(-7) to 1.0 x 10(-1)M) with the determination coefficient of 0.9966 and slope of 15.1+/-0.1 mVdecades(-1). The limit of detection is 1.9 x 10(-7)M. The electrode has a fast response time of 18s and a working pH range of 4-8. The proposed membrane shows excellent discriminating ability towards Hf(4+) ion with regard to several alkali, alkaline earth transition and heavy metal ions. It can be used over a period of 1.5 months with good reproducibility. It is successfully applied for direct determination of Hf(4+) in solutions by standard addition method for real sample analysis.
authors.affiliation: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran. rezaei@cc.iut.ac.ir
authors.forename: B
authors.initials: B
authors.lastname: Rezaei
authors.forename: S
authors.initials: S
authors.lastname: Meghdadi
authors.forename: R Fazel
authors.initials: RF
authors.lastname: Zarandi
mesh_terms: D002138:Calibration; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation / Q000379:methods; D004566:Electrodes; D004867:Equipment Design; D006195:Hafnium / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007097:Imines / Q000737:chemistry*; D008567:Membranes, Artificial; D010636:Phenols / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007097:Imines; D008567:Membranes, Artificial; C532037:N,N'-bis(alpha-methylsalicylidene)dipropylenetriamine; D010636:Phenols; D014874:Water Pollutants, Chemical; D006195:Hafnium