Determination of pesticides in foods of vegetal origin by thin-layer chromatography

Samples of fruit and vegetables analysed by the "multimethod" S19 were dete rmined by thin-layer chromatography with automated multiple development (AM D) and UV-detection. It was found that the eluates of the mini silica gel c olumn were not suited for the determination of agents because of strong mat rix influences. After the purification of the solutions by solid-phase extr action on an amino cartridge the disturbing accompanying substances of the eluates 4 and 5 could be removed to that extent that the agents chloroxuron , imazalil and thiodicarb were detectable in the matrices of current, kiwi, mango, paprika, peach and grapes. In some cases, detection limits were ach ieved that satisfy the German legal limits. However, rates of retrieval cou ld not be determined within the framework of this work.