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American Chemical Society, Journal of The American Society for Mass Spectrometry, 8(14), p. 803-817, 2003

DOI: 10.1016/s1044-0305(03)00333-7

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Identification of Photocatalytic Degradation Products of Diazinon in TiO2 Aqueous Suspensions Using GC/MS/MS and LC/MS with Quadrupole Time-of-Flight Mass Spectrometry

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The photocatalytic degradation of the organophosphorus insecticide diazinon in aqueous suspensions has been studied by using titanium dioxide as a photocatalyst. The degradation of the insecticide was a fast process and included the formation of several intermediates that were identified using GC/ion-trap mass spectrometry with EI or CI in positive and negative ionization mode and HPLC/electrospray-QqTOF mass spectrometry. Since primarily hydroxy derivatives were identified in these aqueous suspensions, the mechanism of degradation was probably based on hydroxyl radical attack. The initial oxidative pathways of the degradation of diazinon involved the substitution of sulfur by oxygen on the Pz.dbnd6;S bond, cleavage of the pyrimidine ester bond, and oxidation of the isopropyl group. Exact mass measurements of the derivatives allowed the elemental formula of the molecules to be determined confidently. Similarities to the metabolic pathways occurring in living organisms were observed.