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Harir, M. ; Chnirheb, A. ; Kanawati, B. ; El Azzouzi, M.* ; Schmitt-Kopplin, P.

Chromatography and high-resolution mass spectrometry for the characterization of the degradation products of the photodegradation of amidosulfuron: An analytical approach.

J. Agric. Food Chem. 61, 5271-5278 (2013)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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Simulated sunlight irradiation causing degradation of amidosulfuron, a pyrimidinylsulfonylurea herbicide, has been investigated in aqueous solution. The main degradation products were followed up by ultrahigh-pressure liquid chromatography with a UV detector (UHPLC-UV) and identified by combining ultrahight-pressure liquid chromatography-mass spectrometry (UHPLC-MS) and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). On the basis of the retrosynthetic analysis, the most identified degradation products were mainly due to the losses of methylsulfamic acid (CH5NO3S), sulfocarbamic acid (CH3NO5S), carbamic acid (CH3NO2), methyl(methylsulfonyl)sulfamic acid (C2H7NO5S2), N-methylmethanesulfonamide (C2H7NO2S), and sulfonic acid (H2SO4) molecules. Accordingly, O and S-demethylation as well as hydroxylation processes were also observed. Sum formulas of the main degradation products were assigned, and a mechanical pathway is proposed.

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