Abstract

The role of gamma irradiation on removal of pesticides in aqueous solutions or in vegetables and fruits was investigated. Radiation - induced decontamination of pesticides is generally greater in aqueous solutions than in selected vegetables and fruits. Residues of malathion (0.5ppm in potatoes, 8ppm in onions and dates), pirimiphos-methyl (1ppm in onions and grapes) and cypermethrin (0.05ppm in potatoes and 0.1ppm in onions) were not reduced to below maximum residue limits (MRLs) for irradiation doses up to 1kGy. The same trend was observed when irradiation was performed for grapes fortified with malathion (8ppm) and cypermethrin (2ppm) for absorbed doses up to 2kGy. Ionizing radiation reduced the residues of pirimiphos-methyl (0.05ppm in potatoes at1kGy, 1ppm in grapes at 2kGy and 0.1ppm in dates at1kGy), malathion (8ppm in grapes at 7kGy) and cypermethrin (2ppm in grapes at 7kGy) to below maximum residue limits (MRLs).

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