title: Conditioning of renewable silver amalgam film electrode for the characterization of clothianidin and its determination in selected samples by adsorptive square-wave voltammetry.
abstract: A new square-wave adsorptive stripping voltammetric (SWAdSV) method was developed for the determination of the neonicotinoid insecticide clothianidin (Clo), based on its reduction at a renewable silver amalgam film electrode (Hg(Ag)FE). The key point of the procedure is the pretreatment of the Hg(Ag)FE by applying the appropriate conditioning potential (-1.70 V vs. Ag/AgCl reference electrode). Under the optimized voltammetric conditions, such pretreatment resulted in the peak for the Clo reduction in Britton-Robinson buffer pH 9.0 at about -0.60 V, which was used for the analytical purpose. The developed SWAdSV procedure made it possible to determine Clo in the concentration range of 6.0×10(-7)-7.0×10(-6) mol L(-1) (LOD=1.8×10(-7) mol L(-1), LOQ=6.0×10(-7) mol L(-1)) and 7.0×10(-6)-4.0×10(-5) mol L(-1) (LOD=1.3×10(-6) mol L(-1), LOQ=4.2×10(-6) mol L(-1)). The repeatability, precision, and the recovery of the method were determined. The effect of common interfering pesticides was also investigated. Standard addition method was successfully applied and validated for the determination of Clo in spiked Warta River water, corn seeds samples, and in corn seeds samples treated with the commercial formulation PONCHO 600 FS.
authors.affiliation: Department of Instrumental Analysis, University of Lodz, Pomorska 163, 90-236 Lodz, Poland.
authors.forename: Mariola
authors.initials: M
authors.lastname: Brycht
authors.forename: Sławomira
authors.initials: S
authors.lastname: Skrzypek
authors.forename: Valéria
authors.initials: V
authors.lastname: Guzsvány
authors.forename: Janoš
authors.initials: J
authors.lastname: Berenji
mesh_terms: D055664:Electrochemical Techniques; D004566:Electrodes; D017743:Equipment Reuse; D006146:Guanidines / Q000032:analysis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008628:Mercury / Q000737:chemistry; D000073943:Neonicotinoids; D010575:Pesticides / Q000032:analysis*; D015203:Reproducibility of Results; D045483:Rivers / Q000737:chemistry*; D012834:Silver / Q000737:chemistry; D013844:Thiazoles / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D006146:Guanidines; D000073943:Neonicotinoids; D010575:Pesticides; D013844:Thiazoles; D014874:Water Pollutants, Chemical; C480342:clothianidin; D012834:Silver; D008628:Mercury
keywords: Clothianidin; Corn seeds; Determination; Renewable silver amalgam film electrode; River water; Voltammetry