title: Square wave adsorptive stripping voltammetric determination of diazinon in its insecticidal formulations.
abstract: The pesticide diazinon was determined in its insecticidal formulations by square wave adsorptive stripping voltammetry. The method of its determination is based on the irreversible reduction reaction at the hanging mercury drop electrode. The optimal signal was detected at -1.05 V vs. Ag/AgCl in Britton-Robinson buffer at pH 4.4. Various parameters such as pH, buffer concentration, frequency, amplitude, step potential, accumulation time, and potential were investigated to enhance the sensitivity of the determination. The highest response was recorded at an accumulation potential -0.4 V, accumulation time 60 s, amplitude 75 mV, frequency 100 Hz, and step potential 5 mV. The pesticide electrochemical behavior was considered under experimental conditions. The electroanalytical procedure enabled diazinon determination in the concentration range 4.0 × 10(-8)-3.9 × 10(-7) mol L(-1) in supporting electrolyte. The detection and quantification limit were found to be 1.1 × 10(-8) and 3.7 × 10(-8) mol L(-1), respectively. The method was applied successfully in the determination of the active ingredients in the insecticidal formulations Diazinon 10GR and Beaphar 275.
authors.affiliation: Department of Instrumental Analysis, University of Lodz, Pomorska 163, 90-236 Lodz, Poland. dguziejewski@uni.lodz.pl
authors.forename: Dariusz
authors.initials: D
authors.lastname: Guziejewski
authors.forename: Sławomira
authors.initials: S
authors.lastname: Skrzypek
authors.forename: Witold
authors.initials: W
authors.lastname: Ciesielski
mesh_terms: D000327:Adsorption; D003976:Diazinon / Q000032:analysis / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000032:analysis / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D007306:Insecticides; D008628:Mercury; D003976:Diazinon
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