Degradation of Chlorpyrifos-Ethyle by gamma radiation

H. Meguenni, M. Mahlous, S. Zoubiri

Abstract


Abstarct: Chlorpyrifos-ethyle is an organophosphorus pesticide causing problems in the central and peripheral nervous system, respiratory system, and the digestive tract of human beings and animals. This study concerns the degradation of chlorpyrifos-ethyle dissolved in acetonitrile by exposition to ionizing radiation. The solution was irradiated to absorbed doses varying from 1 to 50kGy, using a 60Co gamma source. The variation of chlorpyrifos-ethyle concentration as a function of absorbed dose was followed by HPLC analyses. The results showed that the chlorpyrifos-ethyle was completely degraded at the dose of 50kGy. The identification of by-products formed during radiation degradation process of chlorpyrifos-ethyle was made using gas chromatography associated to mass spectrometry (GC-MS). Consequently, three by-products were identified namely: 2-hydroxy-3,5,6,- trichloropyridine (TCP), phosphoric acid, diethyl 3,5,6-trichloro-2-pyridinyl ester, and 2-  furancarboxaldehyde, 5-(hydroxymethyl).   

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