Journal
ANALYTICAL METHODS
Volume 8, Issue 23, Pages 4563-4575Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ay01161f
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A new sensitive, selective and validated HPLC-DAD method was developed for the simultaneous determination of three neonicotinoid insecticides named dinotefuran, thiamethoxam and Clothianidin with their metabolite 1-methyl-3-nitroguanidine in cucumbers and soil based on QuEChERS as a pretreatment procedure. In the QuEChERS procedure, cucumber samples were extracted with acetonitrile and cleaned using C18, while soil samples were extracted with a mixture of acetonitrile : dichloromethane (1 : 2). The HPLC conditions were optimized where the neonicotinoids were separated using a gradient elution of water : acetonitrile and a Synergy Hydro RP C18 column. Matrix matched calibration standards were prepared in cucumbers and soil to eliminate the interference of the matrix. Relative standard deviations (RSDs) were less than 2.08% for all of the recovery tests. The limits of detection (LODs) and quantification (LOQs) for the neonicotinoids were in the ranges of 0.01-0.08 mu g g(-1) and 0.03-0.24 mu g g(-1), respectively. The method was applied successfully to determine residues and rates of disappearance of the three neonicotinoids from cucumbers and soil and their half lives.
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