Residue analysis of flucarbazone-sodium, mesosulfuron-methyl, clodinafop-propargyl and clodinafop in wheat
Received:October 29, 2018    Download the full
DOI：10.16801/j.issn.1008-7303.2019.0030
Key Words:flucarbazone-sodium  mesosulfuron-methyl  clodinafop-propargyl  clodinafop  wheat  residue  high-performance liquid chromatography-tandem mass spectrometry
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Author NameAffiliationE-mail
JING Jing College of Science, China Agricultural University, Beijing 100193, China  
FENG Xiaoxiao College of Science, China Agricultural University, Beijing 100193, China  
PAN Lixiang College of Science, China Agricultural University, Beijing 100193, China  
XU Tianheng College of Science, China Agricultural University, Beijing 100193, China  
ZHANG Hongyan College of Science, China Agricultural University, Beijing 100193, China :hongyan@cau.edu.cn 
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Abstract:
      A modified QuEChERS method was developed and validated for the determination of flucarbazone-sodium, mesosulfuron-methyl, clodinafop-propargyl and clodinafop in wheat kernel and straw by high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS). The wheat kernel was extracted with 10 mL acetonitrile, after 5 mL 0.1% formic acid solution was added to improve the extraction efficiency. Samples were cleaned up by 50 mg C18 and 100 mg anhydrous MgSO4. After adding 10 mL 2% formic acid solution, the wheat straw was extracted with 10 mL acetonitrile. 100 mg C18 and 200 mg anhydrous MgSO4 were used to clean up the samples. The average recoveries of four compounds in wheat kernel and wheat straw were 76%-97% and 83%-102%, respectively, with the relative standard deviations (RSDs) for those four compounds less than 10%. Good linearity was achieved with determination coefficients higher than 0.99. The limit of quantity (LOQ) is 0.005 mg/kg for flucarbazone-sodium, 0.01 mg/kg for mesosulfuron-methyl, 0.05 mg/kg for clodinafop-propargyl and clodinafop. This method meets the requirements of pesticide residue analysis.
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