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The multiclass pesticide multiresidue method for the simultaneous determination of diflubenzuronin agricultural products was conducted by using HPLC-UVD. The method was validated through theguidelines of linearity, specificity, limit of detection (LOD), limit of quantification (LOQ), accuracy and precisionwith pesticide-free spinach, Korean cabbage, eggplant, squash, sweet pepper, cucumber, Korean melon. Thecalibration curve of diflubenzuron was linear over the concentration range of 0.05-5 mg/kg with correlationcoefficient of above 0.. The limit of detection and quantification was 0.008 and 0.02 mg/kg. Meanrecoveries of diflubenzuron for each sample were 77.5-105.6%. Relative standard deviation (RSD) inrecoveries were all less than 20%. The intra-day and inter-day precision (RSD) were 0.4-1.9% and 0.7-1.9%,respectively. The result of validation indicated that this method was accurate and rapid assay. Key words multiclass pesticide multiresidue method, agricultural products, diflubenzuron, HPLC

Analysis of Diflubenzuron in Agricultural Commodities by Multiresidue Method