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Voltammetric Behavior of the Insecticide Pymetrozine on a Mercury Meniscus Modified Silver Solid Amalgam Electrode
Authors: Šelešovská Renáta | Janíková Lenka | Kadubcová Michaela | Štěpánková Michaela
Year: 2016
Type of publication: článek v odborném periodiku
Name of source: Analytical Letters
Page from-to: 4-18
Titles:
Language Name Abstract Keywords
cze Voltametrické chování insekticidu pymetrozinu na rtuťovým meniskem modifikované stříbrné pevné amalgámové elektrodě V rámci práce bylo studováno voltametrické chování insekticidu pymetrozinu na rtuťovým meniskem modifikované stříbrné pevné amalgámové elektrodě v závislosti na pH a rychlosti polarizace. Poté byla vyvinuta metoda stanovení pymetrozinu, která byla aplikována při analýze přírodních vod a insekticidního přípravku. Visící rtuťová kapková elektroda; insekticid; rtuťovým meniskem modifikovaná stříbrná pevná amalgámová elektroda; pymetrozin; voltametrie
eng Voltammetric Behavior of the Insecticide Pymetrozine on a Mercury Meniscus Modified Silver Solid Amalgam Electrode A novel sensitive voltammetric method for the determination of the insecticide pymetrozine was designed using a solid working electrode. A mercury meniscus modified silver solid amalgam electrode in connection with differential pulse voltammetry was found to be appropriate for the determination of the insecticide. Pymetrozine provided one well-developed reduction peak suitable for analytical purposes at approximately −800 millivolts (vs. the Ag/AgCl electrode) in an acidic medium. The voltammetric behavior of pymetrozine as a function of the pH of the supporting electrolyte and scan rate was investigated using cyclic voltammetry and direct current voltammetry, respectively. The optimum conditions for determination using differential pulse voltammetry were in a Britton-Robinson buffer at pH 3.0 with a limit of detection of 5.4 × 10−8 moles per liter and a linear dynamic range from 2 × 10−7 to 1 × 10−4 moles per liter. The relative standard deviations of repeated determinations (n = 5) at various concentrations of pymetrozine did not exceed 3%. The results obtained using a silver solid amalgam electrode were compared with those achieved on hanging mercury drop electrode. The influence of possible interfering agents was also studied. The practical application of the method was verified by analysis of pesticide preparations and fortified river water. Hanging mercury drop electrode; insecticide; mercury meniscus modified silver solid amalgam electrode; pymetrozine; voltammetry

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