Determination of zineb in tap water and tomato samples by adsorptive catalytic stripping voltammetry

Abstract

This paper describes a sensitive and accurate adsorptive catalytic stripping voltammetric method for the determination of zineb (zinc ethylene-bis-dithiocarbamate) in tap water and tomato samples. The method is based on the reduction of adsorbed zineb at a hanging mercury drop electrode following its catalytic oxidation using peroxydisulfate as an oxidizing reagent. Chemical and instrumental parameters of the process were optimized. The catalytic mechanism of the reduction of zineb is discussed as well. The limits of detection (3 s) and quantification (10 s) and linear range of the method for accumulation time of 60 s were calculated as 8.1 nM, 28 nM, and 0.028-7.00 µ M, respectively. The relative standard deviation of the method was 3.68% for 2.5 µ M zineb (N = 5). The proposed method was applied successfully for the determination of zineb in tap water and tomato samples.

A combination of dispersive liquid–liquid microextraction and surface plasmon resonance sensing of gold nanoparticles for the determination of ziram pesticide

“…The wheat sample was also collected from local farm (Shadegan, Iran). Two grams of each sample was weighed, mixed with 25 mL ethanol, and stirred for 2 h. The mixture was then filtered and diluted to 50 mL [14,15,31]. Paddy soil collected from local farm (Shadegan, Iran) was prepared like wheat sample, but it was treated with 1 mL of 0.082 mol/L of sodium fluoride solution [16].…”

Recent Applications of Mercury Electrodes for Monitoring of Pesticides: A Critical Review

“…R13: Reduction of adsorbed analyte in the presence of peroxydisulfate (a catalytic process) . Zineb (Fig.…”

“…R13:R eduction of adsorbed analytei nt he presence of peroxydisulfate (a catalyticp rocess) [88].Z ineb (Fig.2V) can be determined via AdSV at HMDE basedo nt he reduction of adsorbed analyte following its catalytic oxidation using peroxydisulfate as an oxidizingr eagent.…”