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 (Ep) versus pH exhibited two linear segments with a break at pH 4.0 which corresponded to the pKa ± 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 μmol 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 μmol 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® 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.