Dicamba Analysis on Primesep and Obelisc Mixed-Mode HPLC Columns

 

Dicamba is a widely used herbicide. Dicamba mimics auxin, a plant growth hormone, increasing growth beyond the resource availability of the plant. The EURL (European Union Reference Laboratory) included a QuEChERS (Quick, Easy, Cheap, Rugged, and Safe) method for dicamba as a target pesticide for EUPT-SRM. Obelisc R and Primesep B2 were used to retain dicamba and separate it from impurities. Primesep B2 contains embedded basic ion-pairing groups while Obelisc R contains embedded ionic and hydrophobic groups which can assist in fine tuning separations. Method is LC/MS compatible and can be used as a general approach for analyzing dicamba, other auxin-like phenoxy acids, and dozens of other pesticides.