A derivatization-free, rapid, and sensitive high performance liquid chromatography  method has been developed and validated for the determination of dicamba residues in soil, maize stem, and maize grain. Strong anion-exchange cartridge solid-phase extraction cartridges were used for sample preparation. Reversed-phase high performance liquid chromatography with diode array detection was used for separation and quantification of the pesticide. This method obtained a recovery rate of more than 86%, with standard deviation less than 6.75%, and limit of quantification of 0.05 mg kg-1. Using the optimized protocol, the half-life of dicamba from experimental field was found to be 3.0 and 2.2 days in soil and maize stems. Direct confirmation of dicamba residues in field-treated samples was realized by ultra performance liquid chromatography-mass spectrometry.

Determination of dicamba residues in maize and soil from a field trial using ion-exchange solid-phase extraction and high performance liquid chromatography with DAD detection

248th National Meeting (2014)

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