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Characterization of imazamox degradation by-products by using liquid chromatography mass spectrometry and high-resolution Fourier transform ion cyclotron resonance mass spectrometry

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Abstract

The photodecomposition of imazamox, a herbicide of the imidazolinone family, was investigated in pure water. The main photoproducts from the photolysis were followed over time by liquid chromatography mass spectrometry and structures were proposed from exact mass determinations obtained by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. The method comprised exact mass determination with better than 0.2 ppm mass accuracy and a corresponding structural visualization taking care of respective isotopes with an adapted van Krevelen diagram that enabled a systematic approach to the characterisation of the elementary composition of each photoproduct. By taking advantage of the high resolving power of FT-ICR MS to make precise formula assignments, the derived 2D van Krevelen diagram (O/C; H/C; m/z) enabled one to structurally differentiate the formed photoproducts and to propose a degradation pathway for imazamox.

Overview of applied method to analyse the photolysis process of imazamox herbicide

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Acknowledgements

The authors thank the German Academic Exchange Service (DAAD) for a grant to MH and the German–Israeli Foundation for Scientific Research and Development (GIF) for financial support of MH and MF.

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Authors and Affiliations

  1. GSF-National Research Center for Environment and Health, Institute of Ecological Chemistry, Ingolstädter Landstraße 1, 85764, Neuherberg, Germany

    M. Harir, M. Frommberger, A. Gaspar & Ph. Schmitt-Kopplin

  2. LUFA Speyer, Obere Langgasse 40, 67346, Speyer, Germany

    D. Martens

  3. Rumbecker Höhe 10, 59821, Arnsberg, Germany

    A. Kettrup

  4. Faculty of Sciences, University Mohamed V-Agdal, Av. Ibn Batouta, BP 1014, Rabat, Morocco

    M. Harir & M. El Azzouzi

Authors
  1. M. Harir
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  2. M. Frommberger
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  3. A. Gaspar
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  4. D. Martens
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  5. A. Kettrup
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  6. M. El Azzouzi
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  7. Ph. Schmitt-Kopplin
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Correspondence to Ph. Schmitt-Kopplin.

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Harir, M., Frommberger, M., Gaspar, A. et al. Characterization of imazamox degradation by-products by using liquid chromatography mass spectrometry and high-resolution Fourier transform ion cyclotron resonance mass spectrometry. Anal Bioanal Chem 389, 1459–1467 (2007). https://doi.org/10.1007/s00216-007-1343-7

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  • DOI: https://doi.org/10.1007/s00216-007-1343-7

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