Dissipation and Dynamics of Mesotrione in Maize and Soil Under Field Ecosystem

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• 作者：Yuebing Sun (1) (2)
  Yingming Xu (1) (2)
  Yang Sun (1) (2)
  Xu Qin (1) (2)
  Qian Wang (1) (2)
  
• 关键词：Mesotrione ; Field condition ; Dissipation ; Maize ; Residue
• 刊名：Bulletin of Environmental Contamination and Toxicology
• 出版年：2013
• 出版时间：February 2013
• 年：2013
• 卷：90
• 期：2
• 页码：242-247
• 全文大小：493KB
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• 作者单位：Yuebing Sun (1) (2)
  Yingming Xu (1) (2)
  Yang Sun (1) (2)
  Xu Qin (1) (2)
  Qian Wang (1) (2)
  
  1. Key Laboratory of Original Agro-Environmental Quality, Ministry of Agriculture, Tianjin, 300191, China
  2. Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin, 300191, China
  
• ISSN：1432-0800

文摘

Modified QuEChERS-HLPC (quick, easy, cheap, effective, rugged and safe) methods for the analysis of mesotrione in maize and soil were developed and validated. At three fortification levels of 0.01, 0.1 and 0.5?mg?kg? mesotrione, the recoveries of mesotrione in maize plants, maize and soil were in the range of 85.95?%-6.05?%, with relative standard deviations (RSD) of 2.89?%-.83?%. The limit of quantification (LOQ) of method was 0.001?mg?kg? for maize and soil. In the supervised field trials, the degradation rates of mesotrione were described using first-order kinetics and mesotrione dissipation in maize plants coincided with C t ?=?1.735e?.0194t with the half-life 3.94 days in Tianjin, and C t ?=?4.9536e?.7237t with the half-life 5.10 days in Jilin. As for soil, C t ?=?20.272e?.208t with the half-life 2.98 days in Tianjin, and C t ?=?5.5835e?141t with the half-life 4.49 days in Jilin. At pre-harvest interval (PHI) of 0 and 20 days, the final residue levels of mesotrione could not be detected in maize and soil at the recommended dosage and 1.5 times recommended dosage.