Harir M, Frommberger M, Gaspar A, Martens D, Kettrup A, El Azzouzi M, Schmitt-Kopplin Ph
GSF-National Research Center for Environment and Health, Institute of Ecological Chemistry, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany.
Anal Bioanal Chem. 2007 Nov;389(5):1459-67. doi: 10.1007/s00216-007-1343-7. Epub 2007 Jun 7.
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.
在纯水中研究了咪唑啉酮类除草剂甲氧咪草烟的光解作用。通过液相色谱质谱法跟踪光解产生的主要光产物随时间的变化，并根据电喷雾电离傅里叶变换离子回旋共振质谱法获得的精确质量测定结果推测其结构。该方法包括质量准确度优于0.2 ppm的精确质量测定，以及通过适配的范克雷维伦图对相应同位素进行处理的相应结构可视化，从而能够系统地表征每个光产物的元素组成。利用傅里叶变换离子回旋共振质谱的高分辨能力进行精确的分子式分配，由此得到的二维范克雷维伦图（O/C；H/C；m/z）能够在结构上区分形成的光产物，并提出甲氧咪草烟的降解途径。
