Pesticide residues and food safety of five organophosphorus pesticides used on Chinese chives
Author of the article:SONG Dan1** LI Chuan-Ren1 JIA Chun-Hong2 ZHU Xiao-Dan2 HE Min2**
Author's Workplace：1. College of Agriculture, Yangtze University, Jingzhou 434025, China; 2. Institute of Plant Protection and Environment Protection, Beijing Academy of Agricultural and Forestry Science, Beijing100097, China
Key Words：ultra performance liquid chromatography-triple quadrupole mass spectrometry (UPLC-MS-MS), Chinese chives, chemical pesticide, residue, food safety
Abstract：[Objectives] To collect and analyze data on methamidophos, phorate, parathion-methyl, chlorpyrifos, and parathion residues on Chinese chives in Beijing, Tianjin, Hebei and Shandong provinces. Samples were collected from 2013 to 2016. [Methods] Samples were extracted by acetonitrile, cleaned in a solid phase extraction column packed with carbon (graphite), separated by ultra-performance liquid chromatography, detected by triple quadrupole detector in multi-reaction monitoring model, and quantitatively analyzed with an external standard method by matrix-match standard solution. The method was simple and reliable which could detect these pesticide residues in Chinese chives. [Results] The highest residue concentration of methamidophos decreased from 70.51 mg/kg to 0.03 mg/kg, and the over maximum residue limits (MRL) rate dropped from 38.10% to 2.03%. The highest residue concentration of phorate decreased from 6.45 mg/kg to 0.04 mg/kg and the over MRL rate dropped from 23.81% to 1.35%. The highest residue concentration of parathion-methyl decreased from 6.62 mg/kg to 0.13 mg/kg and the over MRL rate dropped from 25.40% to 2.70%.The highest residue concentration of chlorpyrifos decreased from 3.95 mg/kg to 0.47 mg/kg and the over MRL rate dropped from 15.87% to 4.73%. The highest residue concentration of parathion decreased from 22.69 mg/kg to 0.03 mg/kg and the over MRL rate dropped from 15.08% to 1.35%.[Conclusion] Highest residue concentrations and over MRL ratios of five organophosphorus pesticides in Chinese chives have markedly declined over the past 3 years, but residues of these pesticides can still be detected. To ensure the safety of Chinese chives, the government should strengthen daily supervision of pesticide use, promote integrated pest management and provide better education on the reasonable use of pesticides.