title: An adsorptive stripping voltammetry procedure for ultra-trace determination of U(VI) using double accumulation step on two lead-film working electrodes.
abstract: We report a very sensitive stripping voltammetric procedure for determination of ultra-trace quantity of U(VI) in water samples. A very low detection limit was achieved owing to the application of a new construction of the voltammetric electrode cell with two built-in working electrodes that differed significantly in their surface area. The procedure was based on the double adsorptive accumulation of the U(VI)-cupferron complex onto two lead film working electrodes. Under optimal conditions the detection limit for accumulation time of 120 s for the big electrode and 120 s for the small electrode was about 3.1 × 10(-11) mol L(-1), whereas for accumulation time of 480 s for the big electrode and 240 s for the small electrode it was about 1.1 × 10(-11) mol L(-1). The proposed method was successfully validated using certified reference material seawater NASS-5.
authors.affiliation: Faculty of Chemistry, Maria Curie-Sklodowska University, 20-031 Lublin, Poland.. Electronic address: mkorolcz@poczta.umcs.lublin.pl.
authors.forename: Mieczyslaw
authors.initials: M
authors.lastname: Korolczuk
authors.affiliation: Faculty of Chemistry, Maria Curie-Sklodowska University, 20-031 Lublin, Poland.
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Grabarczyk
authors.affiliation: Faculty of Chemistry, Maria Curie-Sklodowska University, 20-031 Lublin, Poland.
authors.forename: Iwona
authors.initials: I
authors.lastname: Rutyna
mesh_terms: D000327:Adsorption; D002138:Calibration; D004563:Electrochemistry; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D009602:Nitrosamines / Q000737:chemistry*; D012623:Seawater / Q000032:analysis* / Q000737:chemistry; D014501:Uranium / Q000032:analysis* / Q000737:chemistry*
chemical_list: D009602:Nitrosamines; D014501:Uranium; C031808:cupferron
keywords: Adsorptive stripping voltammetry; Determination; Uranium (VI); Water samples