Determination of difenzoquat in cereals by GC/MS
1998
Tsukioka, T. (Nagano-ken. Government Office (Japan)) | Yoshida, T. | Sato, M.
An analytical method by GC/MS has been established for the herbicide difenzoquat in cereals. Difenzoquat was extracted with acetone, concentrated with a rotary evaporator, and applied to an Extrelut 20 column. The column was washed with n-hexane, eluted with ethyl acetate containing 4 % formic acid, and concentrated. The residue was dissolved in 0.1 mol/L NaOH solution, adsorbed on an ODS mini column, washed with 50 % methanol, and eluted with ethyl acetate containing 4 % formic acid. The elute was concentrated and analyzed by GC/MS. This method gave a recovery of over 80 % with a C. V. below 6 % and a detection limit of 1 mug/kg. This method, with excellent sensitivity and selectivity, should be useful as a routine analytical method for cereals
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