[Gas chromatographic determination of sym-triazine herbicides in drugs from vegetable sources (author's transl)]

Several separation phases were tested for effectiveness in the gas chromatographic determination of residues of sym-triazine herbicides in officinal drugs. Carbowax 20 M, OV 225 and OV 330 are well suited for separating this group of active agents. A NP-FID was used as a gas chromatographic detector. Sample preparation was optimized. Chloroform (as an extracting agent) and the shaking method were best suited for extracting. The samples were purified by column chromatography, DMSO/petroleum ether partition and purification by extraction from a hydrochloric solution being performed subsequently if necessary. The recovery rates and the reproducibility observed for various drugs and different extraction methods were compared. The limit of detection of the method laid at 0.02 mg/kg.