title: Ultra-sensitive quantification of copper in food and water samples by electrochemical adsorptive stripping voltammetry.
abstract: A new electrochemical adsorptive stripping voltammetry method was developed for the determination of trace amounts of copper in food and water samples. The study of electrochemical behavior of Cu ion indicated that Cu(II) and Schiff base formed a complex in H₃BO₄-NaOH buffer solution (pH = 7.25). An accumulation potential of -100 mV (vs Ag/AgCl) was applied while the solution was stirred for 60 s. The response curve was recorded by scanning the potential, and the peak current of -0.31 V (vs Ag/AgCl) was recorded. The peak current and concentration of copper accorded with linear relationship in the range of 0.04-120 ng mL(-1). The relative standard deviation (for 12 ng mL(-1) of copper) was 1.73%, and the detection limit was 0.007 ng mL(-1). The possible interference of some common ions was studied. The proposed method was applied to the determination of copper in water, rice, wheat, tea, milk, and tomato with satisfactory results.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Ilam University, Ilam, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Goudarziafshar
authors.forename: Mohsen
authors.initials: M
authors.lastname: Nikoorazm
authors.forename: Sayede Shima
authors.initials: SS
authors.lastname: Mortazavi
authors.forename: Shahryar
authors.initials: S
authors.lastname: Abbasi
authors.forename: Abbas
authors.initials: A
authors.lastname: Farmany
mesh_terms: D000327:Adsorption; D000822:Animal Husbandry; D003300:Copper / Q000032:analysis*; D004563:Electrochemistry; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis*; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D012545:Schiff Bases; D014867:Water / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D012545:Schiff Bases; D014867:Water; D003300:Copper