title: Electrochemical study of the fungicide acibenzolar-s-methyl and its voltammetric determination in environmental samples.
abstract: The electrochemical behavior of new generation fungicide acibenzolar-s-methyl (S-methyl 1,2,3-benzothiadiazole-7-carbothioate, ASM) on the hanging mercury drop electrode (HMDE) was investigated using square wave adsorptive stripping voltammetry. This method of determination is based on the irreversible reduction of ASM at the HMDE. The well-defined ASM peak was observed at -0.4 V (vs. Ag/AgCl) in BR buffer at pH 2.2. The reduction peak current was proportional to concentration of ASM from 1.0 × 10(-8) to 6.0 × 10(-8) mol L(-1) with detection and quantification limit 3.0 × 10(-9) and 1.0 × 10(-8) mol L(-1), respectively. The applicability of the developed method for analysis of spiked samples of tap water, river water, and soil is illustrated. The effect of adsorption on the mercury electrode was studied in detail using the AC impedance method. Possible interferences with other common pesticides and heavy metal ions were examined. Clarification of the electrode mechanism was made using cyclic voltammetry (CV) technique.
authors.affiliation: a Department of Inorganic and Analytical Chemistry, Faculty of Chemistry , University of Lodz , Lodz , Poland.
authors.forename: Dariusz
authors.initials: D
authors.lastname: Guziejewski
authors.forename: Mariola
authors.initials: M
authors.lastname: Brycht
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Nosal-Wiercińska
authors.forename: Sylwia
authors.initials: S
authors.lastname: Smarzewska
authors.forename: Witold
authors.initials: W
authors.lastname: Ciesielski
authors.forename: Sławomira
authors.initials: S
authors.lastname: Skrzypek
mesh_terms: D000327:Adsorption; D055664:Electrochemical Techniques; D004566:Electrodes; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis / Q000737:chemistry; D005659:Fungicides, Industrial / Q000032:analysis* / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D013830:Thiadiazoles / Q000032:analysis* / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D005659:Fungicides, Industrial; D012987:Soil; D013830:Thiadiazoles; D014867:Water; C099403:S-methyl benzo(1,2,3)thiadiazole-7-carbothioate; D008628:Mercury
keywords: Acibenzolar-s-methyl; environmental samples; fungicide; hanging mercury drop electrode (HMDE); square wave adsorptive stripping voltammetry (SWAdSV)