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HPLC-DAD-MSn to investigate the photodegradation pathway of nicosulfuron in aqueous solution

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Abstract

The environmental interest of sulfonylurea herbicides was derived from the possibility of diffusion and penetration of these herbicides in the deepest layers of the ground, in particular in sandy or clay-poor soils, up to the ground waters; another interest of the study is their natural degradation pathway which leads to the formation of new species that are potentially more toxic and stable than the precursor herbicides. In this case, a lower persistence in the environment unfortunately does not correspond to a lower toxicity: hence, the importance of the identification of the species can be potentially formed. Here, nicosulfuron, a typical sulfonylurea herbicide, is considered in order to outline the environmental fate of the molecules generating from the simulation of one of the natural processes that can occur, i.e. photoinduced degradation. Aqueous nicosolfuron solutions underwent a simulated sun irradiation: the new species formed during the degradation process were identified by HPLC-DAD-MS/MS and a degradation pathway was proposed. The effect of temperature and the contribution of the hydrolysis were also evaluated. The use of ESI in both positive ion (PI) and negative ion (NI) mode and APCI in PI mode permits to obtain integrated information about the transformation products that can form; moreover, a study of the total ion chromatogram followed by the extraction of the SIM chromatograms of the most intense m/z signals made possible the identification of five possible photodegradation transformation products.

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Acknowledgments

The authors are grateful for the financial support from AATF (Associazione Ambiente-Territorio e Formazione, Alessandria, Italy), from Regione Piemonte, Direzione Igiene e Sanità Pubblica (Turin, Italy) and from MIUR (Ministero Italiano Università e Ricerca, Rome, Italy).

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  1. DISAV Dipartimento di Scienze dell’Ambiente e della Vita, University of Piemonte Orientale “Amedeo Avogadro”, Viale T. Michel 11, 15121, Alessandria, Italy

    M. Benzi, E. Robotti & V. Gianotti

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  1. M. Benzi
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  2. E. Robotti
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  3. V. Gianotti
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Correspondence to V. Gianotti.

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Benzi, M., Robotti, E. & Gianotti, V. HPLC-DAD-MSn to investigate the photodegradation pathway of nicosulfuron in aqueous solution. Anal Bioanal Chem 399, 1705–1714 (2011). https://doi.org/10.1007/s00216-010-4467-0

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