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The frequent occurrence of pesticide residues in herbal materials was indicated by previous studies. In this study, the concentration of some of the organophosphorus pesticides including parathion, malathion, diazinon and pirimiphos methyl in different kinds of medicinal plants were determined. The samples were collected randomly from ten local markets of different areas of Iran. At the detection limit of 0.5 ng g -1 , parathion and pirimiphos methyl were not detected in any of the samples .  Some amounts of malathion and diazinon were found in  Zataria ,  Matricaria chamomile ,  Spearmint  and  Cumin  Seed samples while, the concentrations of target organophosphorus pesticides in  Borage  samples were below the detection limits of the methods which could be a result of intensive transformation of organophosphorus pesticides by  Borage . In addition the organophosphorus pesticides were detected in all of the samples below the maximum residue levels (MRLs) proposed by the international organizations.

Levels of organophosphorus pesticides in medicinal plants commonly consumed in Iran