title: Sensitive and selective detection of Ag+ in aqueous solutions using Fe3O4@Au nanoparticles as smart electrochemical nanosensors.
abstract: Owing to the selective deposition reaction on the surface of magnetic nanoparticles, we reported a simple and selective magnetic electrochemical method for the detection of Ag(+) ions in aqueous solutions. The analyte deposited on the nanoparticles was brought to the surface of a homemade magnetic electrode and detected electrochemically in 0.1 mol/L KCl solution based on the reaction of Ag0 transferred to AgCl. Under the optimal conditions, the linear response range of Ag(+) ions was 0.117-17.7 μmol/L (R(2)=0.9909) with a detection limit of 59 nmol/L (S/N=3). A series of repeatability measurements 1.0 μmol/L Ag(+) gave reproducible results with a relative standard deviation (RSD) of 4.5% (n=11). The interference from other metal cations can be eliminated by adding EDTA as a co-additive to mask the metal cations. The recoveries ranging from 98.6% to 103.99% after standard additions demonstrate that this sensor has great potential in practical applications. The advantages of this developed method include remarkable simplicity, low cost, and no requirement for probe preparation, among others.
authors.affiliation: State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Huicui
authors.initials: H
authors.lastname: Yang
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Liu
authors.forename: Ruihua
authors.initials: R
authors.lastname: Fei
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Hu
mesh_terms: D002244:Carbon / Q000737:chemistry; D060766:Drinking Water / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry; D055664:Electrochemical Techniques / Q000191:economics / Q000379:methods*; D004566:Electrodes; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006801:Humans; D057230:Limit of Detection; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D059346:Magnets; D011189:Potassium Chloride / Q000737:chemistry; D015203:Reproducibility of Results; D012834:Silver / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D060766:Drinking Water; D058185:Magnetite Nanoparticles; D014873:Water Pollutants; D012834:Silver; D011189:Potassium Chloride; D002244:Carbon; D004492:Edetic Acid; D052203:Ferrosoferric Oxide
keywords: Ag(+); Electrochemical detection; Fe(3)O(4)@Au nanoparticles; Magnetic