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《Agrochemicals》 2015-10
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Residue Analysis and Decline Dynamics of Metalaxyl in Cucumber and Soil

XU Zhen-zhen;JI Hong-wei;LIU Xiu-yuan;ZHOU Yang-quan;SONG Chao;WANG Xiu-guo;LI Yi-qiang;College of Chemistry and Chemical Engineering, Ocean University of China;Plant Protection Center, Agricultural University of China;Plant Protection Center, Tobacco Research Institute of Chinese Academy of Agricultural Sciences;  
[Aims] A HPLC method was established to detect metalaxyl residues in cucumbers and soil, the residue digestion trend was researched, and the application security was evaluated. [Methods] Cucumber and soil samples were extracted with the mixture of acetonitrile and acetic acid, detected by high performance liquid chromatograph with ultraviolet detector. In addition, the results were quantified with external standard method. [Results] The results showed that the average recoveries of metalaxyl in cucumbers and soil at three addition concentrations ranged from88.59 to 95.51% and from 84.06 to 92.77%. The limits of detection were 0.6×10-9g and the limits of quantification were0.02 mg/kg. The dissipation dynamics followed the first order kinetics and the half-lives were 3.3-8.1 d and 4.4-8.6 d,respectively. When metalaxyl was applied after the cucumber was beared, metalaxyl residues in cucumber and soil samples were less than the MRL values(0.5 mg/kg). [Conclusions] When metalaxyl is applied based on the recommended method and dosage, it is safe to cucumber.
【CateGory Index】: S481.8
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