Pang K and Jiye Hu
A liquid chromatography tandem mass spectrometry method with modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) sample preparation was developed for the simultaneous determination of Mesotrione, Ametryn, and MCPA-Na. The mean recoveries were ranged from 72% to 102% (R2<14.4%). A study of dissipation kinetics conducted under open field conditions at two sites during 2016. The half-lives 0.7-14.7 d for mesotrione, 1.2-16.1 d for ametryn and 1.1-3.2 d for MCPA-Na. The terminal residues of three pesticides in maize grain were lower than the maximum residue limits (MRLs) set by China (0.01 mg/kg for mesotrione, 0.05 mg/kg for MCPA-Na) and US (0.05 mg/kg for ametryn) at harvest time as well as at pre-harvest (after apply 96 d and 71 d).
Additional the chronic dietary risk was evaluated using risk quotients method based on Chinese dietary pattern. That were significantly lower than RQ (risk quotient)=1. On the basis of supervised field trial data and dietary exposure risk assessment results, the MRLs values of ametryn were recommended as 0.05 mg/kg for maize grain and maize plant in China, respectively.
These results not only gave insights about the analytes but also contributed to environmental protection and food safety.
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