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首页> 外文期刊>Mass Spectrometry Reviews >MASS SPECTROMETRY OF THE PHOTOLYSIS OF SULFONYLUREA HERBICIDES IN PRAIRIE WATERS
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MASS SPECTROMETRY OF THE PHOTOLYSIS OF SULFONYLUREA HERBICIDES IN PRAIRIE WATERS

机译：淡水中磺酰脲类除草剂光解的质谱分析

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This review of mass spectrometry of sulfonylurea herbicides includes a focus on studies relevant to Canadian Prairie waters. Emphasis is given to data gaps in the literature for the rates of photolysis of selected sulfonylurea herbicides in different water matrices. Specifically, results are evaluated for positive ion electrospray tandem mass spectrometry with liquid chromatography separation for the study of the photolysis of chlorsulfuron, tribenuron-methyl, thifensulfuron-methyl, metsulfuron-methyl, and ethametsulfuron-methyl. LC-MS/MS is shown to be the method of choice for the quantification of sulfonylurea herbicides with instrumental detection limits ranging from 1.3 to 7.2pg (on-column). Tandem mass spectrometry coupled with the use of authentic standards likewise has proven to be well suited for the identification of transformation products. To date, however, the power of time-of-flight MS and ultrahigh resolution MS has not been exploited fully for the identification of unknown photolysis products. Dissipation of the herbicides under natural sunlight fit pseudo-first-order kinetics with half-life values ranging from 4.4 to 99 days. For simulated sunlight, radiation wavelengths shorter than 400nm are required to induce significant photolytic reactions. The correlation between field dissipation studies and laboratory photolysis experiments suggests that photolysis is a major pathway for the dissipation of some sulfonylurea herbicides in natural Prairie waters.
机译：磺酰脲类除草剂的质谱分析包括与加拿大大草原水域有关的研究。强调了文献中在不同水基质中所选磺酰脲类除草剂的光解速率方面的数据空白。具体而言，使用液相色谱分离法对正离子电喷雾串联质谱法的结果进行评估，以研究氯磺隆，苯磺隆甲基，噻吩磺隆甲基，甲磺隆甲基和乙苯磺隆甲基的光解。已证明LC-MS / MS是定量磺酰脲类除草剂的选择方法，仪器检测限范围为1.3至7.2pg（柱上）。串联质谱法和使用真实标准品同样被证明非常适合鉴定转化产物。但是，迄今为止，飞行时间质谱仪和超高分辨率质谱仪的功能尚未完全用于鉴定未知的光解产物。自然光下的除草剂消散符合拟一级动力学，半衰期范围为4.4至99天。对于模拟太阳光，需要短于400nm的辐射波长才能引发明显的光解反应。田间耗散研究与实验室光解实验之间的相关性表明，光解是天然草原水中某些磺酰脲类除草剂消散的主要途径。

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