title: Copper (II) ion selective liquid membrane electrode based on new Schiff base carrier.
abstract: Cu2+ selective PVC membrane electrode based on new Schiff base 2, 2'-[1,9 nonanediyl bis (nitriloethylidyne)]-bis-(1-naphthol) as a selective carrier was constructed. The electrode exhibited a linear potential response within the activity range of 1.0 x 10(-6) - 5.0 x 10(-3) moll(-1) with a Nernstian slope of 29 +/- 1 mV decade(-1) of Cu2+ activity and a limit of detection 8.0 x 10(-7) mol l(-1). The response time of the electrode was fast, 10 s, and stable potentials were obtained within the pH range of 3.5- 6.5. The potentiometric selectivity coefficients were evaluated using two solution method and revealed no important interferences except for Ag+ ion. The proposed electrode was applied as an indicator electrode to potentiometric titration of Cu2+ ions and determination of Cu2+ content in real samples such as black tea leaves and multivitamin capsule.
authors.affiliation: Department of Analytical Chemistry, Faculty of Science, P.O.Box 414, University of Birjand, Birjand, Iran. ssadeghi@birjand.ac.ir
authors.forename: Susan
authors.initials: S
authors.lastname: Sadeghi
authors.forename: Mohammad Taghi
authors.initials: MT
authors.lastname: Vardini
authors.forename: Hossein
authors.initials: H
authors.lastname: Naeimi
mesh_terms: D015374:Biosensing Techniques; D002138:Calibration; D002214:Capsules / Q000032:analysis; D002413:Cations, Divalent; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D018515:Plant Leaves / Q000737:chemistry; D011199:Potentiometry; D012545:Schiff Bases / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry; D013662:Tea / Q000737:chemistry; D014815:Vitamins / Q000737:chemistry; D014873:Water Pollutants
chemical_list: D002214:Capsules; D002413:Cations, Divalent; D012545:Schiff Bases; D013662:Tea; D014815:Vitamins; D014873:Water Pollutants; D012834:Silver; D003300:Copper