Dichlorvos Separation on Obelisc and Primesep Mixed-Mode Columns

 
Dichlorvos is an insecticide used in household products, pet products and used in industry to protect food stores. Effective against caterpillars, aphids, spider mites, thripes and many types of flies. Dichlorvos is prevalent in many urban waterways and can be acutely and chronically toxic to humans. The EURL included dichlorvos as a target pesticide for the EUPT-CF9. Primesep B2 and Obelisc R were used to retain dichlorvos 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 with dozens of pesticides also as a general approach for analyzing dichlorvos and other organophosphate insecticides.

Condition 1

Column Primesep B2, 2.1x150 mm, 5 µm, 100A
Mobile Phase Gradient MeCN - 25-70%, 15 min,  7 min hold
Buffer Gradient AmAc pH 3.0- 30-60 mM, 15 min,  7 min hold
Flow Rate 0.4 ml/min
Detection UV, 250 nm
 

Condition 2

Column Obelisc R, 2.1x150 mm, 5 µm, 100A
Mobile Phase Gradient MeCN - 10-70%, 15 min,  7 min hold
Buffer Gradient AmAc pH 3.0- 20-60 mM, 15 min,  7 min hold
Flow Rate 0.4 ml/min
Detection UV, 250 nm
   

Description

Class of Compounds  Insecticide, Herbicide, Fungicide,  Hydrophobic, Ionizable
Analyzing Compounds Dichlorvos
 

Application Analytes:

Dichlorvos