An optimized LC-MS/MS workflow for evaluating storage stability of fluroxypyr and halosulfuron-methyl in maize samples
文献类型： 外文期刊
作者： Ying, Ying 1 ; Cao, Zhen 1 ; Li, Hui 1 ; He, Jie 3 ; Zheng, Lufei 1 ; Jin, Maojun 1 ; Wang, Jing 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Qual Stand & Testing Technol Agroprod, Beijing 100081, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Agroprod Qual & Safety, Beijing, Peoples R China
3.Guangxi Acad Agr Sci, Inst Qual Stand & Testing Technol Agroprod, Nanning, Peoples R China
关键词： fluroxypyr; halosulfuron-methyl; storage stability; maize; LC-MS/MS; QuEChERS
期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES （ 影响因子：1.99； 五年影响因子：2.116 ）
ISSN： 0360-1234
年卷期： 2020 年 56 卷 1 期
页码：
收录情况： SCI
摘要： Pesticide registration ensures the safety of agricultural products; however, the backlog of field samples often requires lengthy storage periods. Thus, the stability of pesticide residues in stored samples is required information for pesticide registration. We monitored the degradation rates of fluroxypyr and halosulfuron-methyl in maize straw, mature maize grain, and fresh corn matrices to evaluate their storage stability. Analytes were extracted and cleaned up with a modified Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) method and then detected with liquid chromatography tandem-mass spectrometry. We optimized the workflow by testing different clean-up sorbents, LC columns, and chromatographic methods. The linearity correlation coefficients of fluroxypyr and halosulfuron-methyl in the three matrices were >= 0.994. At three fortification levels, the mean recoveries of fluroxypyr and halosulfuron-methyl were 84.2-114.8% and 83.8-105.5% with relative standard deviations of 2.4-9.4% and 2.7-10.2%, respectively. Degradation of the two herbicides in the three matrices was less than 30% over the 70-day storage period, indicating fluroxypyr and halosulfuron-methyl are stable in the tested maize matrices when stored at -20 degrees C for at least 70 days. This study provides a reference method for pesticide residue analysis and can be used as a guide to develop accurate and reasonable pesticide registration procedures.
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