Hydrophilic metabolites of pesticides in food and the environment are seldom analyzed due to the lack of suitable analytical methods. In the present study, a single-run analytical method was developed to… Click to show full abstract
Hydrophilic metabolites of pesticides in food and the environment are seldom analyzed due to the lack of suitable analytical methods. In the present study, a single-run analytical method was developed to determine dimethenamid, saflufenacil and their five metabolites in maize grain and plant. A good linearity was achieved for the matrix-matched calibration curves of the seven analytes with r2 ≥ 0.9991. The average recoveries of dimethenamid, saflufenacil and their metabolites in maize grain and plant were 70.1–113.8% with inter-day relative standard deviations ≤ 21.5%. The limits of detection and quantification for the two herbicides and their metabolites were in the ranges of 0.008–1.4 μg/kg and 0.027–4.7 μg/kg, respectively, in two matrices. The limits of quantification for dimethenamid and saflufenacil in maize grain were below the maximum residue limits proposed by Codex (10 μg/kg). The results from field trials demonstrated the method effective and reliable for monitoring of the target residues in maize.
               
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