Determination of triflumizole by differential pulse polarography in formulation, soil and natural water samples

A novel electroanalytical procedure is proposed for the determination of the triflumizole in formulation, soil and natural water samples using differential pulse polarography (DPP). Triflumizole exhibited a single well-defined cathodic peak over the pH range of 1.0-9.0 in Britton-Robinson (B-R) buffers. The peak potentials were shifted to more negative values upon increasing the pH and a plot of reduction potentials (E-p) versus pH exhibited two linear segments with a break at pH 4.0 which corresponded to the pK(a) +/- 1 value of triflumizole. The peak appeared as a maximum at pH 2.0 (-810 mV versus saturated calomel electrode (SCE)) was well resolved and suitable to be investigated for analytical use. The current-concentration plot obtained using this peak was rectilinear over the range from 2.0 to 91.0 mu mol L-1 with a correlation coefficient of 0.993. The limit of detection (LOD) and limit of quantification (LOQ) were obtained as 0.72 and 2.39 mu mol L-1, respectively. The proposed method was successfully applied to the determination of triflumizole in spiked soil and lake water. The mean recoveries of the pesticide were 102.1 and 103.6% with a relative standard deviation of 1.01 and 2.68% in soil and lake water, respectively. The method was extended to the determination of triflumizole in agrochemical fungicide formulation Trifmine (R) and results were in agreement with that obtained by high-performance liquid chromatographic analysis (HPLC). The influence of some diverse ions and some other pesticides was also investigated. (c) 2006 Elsevier B.V. All rights reserved.