Residues and dissipation dynamics of chlorpyrifos, imidacloprid, spirotetramat and its motablites, difenoconazole in pear
Received:January 16, 2019    Download the full
DOI:10.16801/j.issn.1008-7303.2019.0053
Key Words:chlorpyrifos  imidacloprid  spirotetramat  difenoconazole  pear  residue  dissipation dynamics
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Author NameAffiliationE-mail
MAO Jiangsheng Monitor Inspection & Test Center of Foods Quality of Ministry of Agricultural and Rural Affairs(Jinan)/Institute of Quality Standards & Testing Technology for Agro-products of Shandong Academy of Agricultural Sciences/Shandong Key Laboratory of Testing Technology for Food Quality & Security, Jinan 250100, China  
CHEN Zilei Monitor Inspection & Test Center of Foods Quality of Ministry of Agricultural and Rural Affairs(Jinan)/Institute of Quality Standards & Testing Technology for Agro-products of Shandong Academy of Agricultural Sciences/Shandong Key Laboratory of Testing Technology for Food Quality & Security, Jinan 250100, China  
LI Huidong Monitor Inspection & Test Center of Foods Quality of Ministry of Agricultural and Rural Affairs(Jinan)/Institute of Quality Standards & Testing Technology for Agro-products of Shandong Academy of Agricultural Sciences/Shandong Key Laboratory of Testing Technology for Food Quality & Security, Jinan 250100, China  
ZHANG Wenjun Monitor Inspection & Test Center of Foods Quality of Ministry of Agricultural and Rural Affairs(Jinan)/Institute of Quality Standards & Testing Technology for Agro-products of Shandong Academy of Agricultural Sciences/Shandong Key Laboratory of Testing Technology for Food Quality & Security, Jinan 250100, China  
DING Ruiyan Monitor Inspection & Test Center of Foods Quality of Ministry of Agricultural and Rural Affairs(Jinan)/Institute of Quality Standards & Testing Technology for Agro-products of Shandong Academy of Agricultural Sciences/Shandong Key Laboratory of Testing Technology for Food Quality & Security, Jinan 250100, China  
FANG Liping Monitor Inspection & Test Center of Foods Quality of Ministry of Agricultural and Rural Affairs(Jinan)/Institute of Quality Standards & Testing Technology for Agro-products of Shandong Academy of Agricultural Sciences/Shandong Key Laboratory of Testing Technology for Food Quality & Security, Jinan 250100, China  
GUO Changying Monitor Inspection & Test Center of Foods Quality of Ministry of Agricultural and Rural Affairs(Jinan)/Institute of Quality Standards & Testing Technology for Agro-products of Shandong Academy of Agricultural Sciences/Shandong Key Laboratory of Testing Technology for Food Quality & Security, Jinan 250100, China cyguo808@163.com 
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Abstract:
      The instrument anlysis method and field testing method were employed for the investigation 3 of the dissipation dynamics and residues of chlorpyrifos, imidacloprid,spirotetramat and its motablites, difenoconazole, in pear. The samples were extracted with acetonitrile and purified by sodium chloride salting out. Chlorpyrifos was detected by GC/MS/MS, and the other three pesticides were detected by LC/MS/MS. Quantization was performed using external standard method. The results showed that the dissipation dynamics of chlorpyrifos, imidacloprid, spirotetramat and its motablites, difenoconazole, in pear meet the first-degree dynamics matrix. There half-lives were 4.4, 12.2, 13.1 and 10.3 d, respectively. From 7 days after the pesticide application to harvest, the final residues of the above 4 pesticides in pear did not exceed the MRL value of China. According to the recommended application concentration and operating procedures, All four pesticides can be safely used on pears.
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