title: Development and Validation of Chronopotentiometric Method for Imidacloprid Determination in Pesticide Formulations and River Water Samples.
abstract: A new electrochemical method for determination of imidacloprid using chronopotentiometry on thin film mercury and glassy carbon electrode was presented. The most important experimental parameters of chronopotentiometry were examined and optimized with respect to imidacloprid analytical signal. Imidacloprid provided well-defined reduction peak in Britton-Robinson buffer on thin film mercury electrode at -1.0 V (versus Ag/AgCl (KCl, 3.5 mol/L)) and on glassy carbon electrode at -1.2 V (versus Ag/AgCl (KCl, 3.5 mol/L)). The reduction time was linearly proportional to concentrations from 0.8 to 30.0 mg/L on thin film mercury electrode and from 7.0 to 70.0 mg/L on glassy carbon electrode. The detection limits were 0.17 mg/L and 0.93 mg/L for thin film mercury and glassy carbon electrode, respectively. The estimation of method precision as a function of repeatability and reproducibility showed relative standard deviations values lower than 3.73%. Recovery values from 97.3 to 98.1% confirmed the accuracy of the proposed method, while the constancy of the transition time with deliberated small changes in the experimental parameters indicated a very good robustness. A minor influence of possible interfering compounds proved good selectivity of the method. Developed method was applied for imidacloprid determination in commercial pesticide formulations and river water samples.
authors.affiliation: Faculty of Technology, Department of Applied and Engineering Chemistry, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia.
authors.forename: Ana
authors.initials: A
authors.lastname: Đurović
authors.affiliation: Faculty of Technology, Department of Applied and Engineering Chemistry, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia.
authors.forename: Zorica
authors.initials: Z
authors.lastname: Stojanović
authors.affiliation: Faculty of Technology, Department of Applied and Engineering Chemistry, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia.
authors.forename: Snežana
authors.initials: S
authors.lastname: Kravić
authors.affiliation: Institute of Field and Vegetable Crops, Maksima Gorkog 30, 21000 Novi Sad, Serbia.
authors.forename: Nada
authors.initials: N
authors.lastname: Grahovac
authors.affiliation: Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovića 8, 21000 Novi Sad, Serbia.
authors.forename: Vojislava
authors.initials: V
authors.lastname: Bursić
authors.affiliation: Institute of Public Health, Bulevar Despota Stefana 54a, 11000 Belgrade, Serbia.
authors.forename: Gorica
authors.initials: G
authors.lastname: Vuković
authors.affiliation: Faculty of Technology, Department of Applied and Engineering Chemistry, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia.
authors.forename: Zvonimir
authors.initials: Z
authors.lastname: Suturović