Spinach or Amaranth Contains Highest Residue of Metalaxyl, Fluazifop-P-butyl, Chlorpyrifos, and Lambda-cyhalothrin on Six Leaf Vegetables upon Open Field Application

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• 作者：Sufang Fan ; Fengzu Zhang ; Kailin Deng ; Chuanshan Yu ; Shaowen Liu ; Pengyue Zhao ; Canping Pan
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2013
• 出版时间：March 6, 2013
• 年：2013
• 卷：61
• 期：9
• 页码：2039-2044
• 全文大小：299K
• 年卷期：v.61,no.9(March 6, 2013)
• ISSN：1520-5118

文摘

To select representative leaf vegetables which may contain the highest residue, field experiments of metalaxyl, fluazifop-P-butyl, chlorpyrifos, and lambda-cyhalothrin on six crops including pakchoi, rape, crown daisy, amaranth, spinach, and lettuce were designed and conducted. In this study, a high-performance liquid chromatograph and electrospray ionization tandem mass spectrometer with multiple reaction monitoring was used to simultaneously determine metalaxyl and fluazifop-P-butyl residue in various samples, and a gas chromatograph with electron capture detector was used to detect chlorpyrifos and lambda-cyhalothrin. The limits of quantification (LOQ) of metalaxyl, fluazifop-P-butyl, chlorpyrifos, and lambda-cyhalothrin were in the range of 0.001鈥?.01 mg kg^鈥? for all samples, and the average recoveries of all pesticides ranged from 67.6 to 119.1% at spiked levels of 0.01鈥?.1 mg kg^鈥?. In supervised field trials, the half-lives of metalaxyl, fluazifop-P-butyl, chlorpyrifos, and lambda-cyhalothrin were in the range of 1.11鈥?.79 days, 1.11鈥?.27 days, 1.13鈥?.17 days, and 1.77鈥?.24 days. It was also found that all pesticide residues in spinach and/or amaranth were higher than others after application. It is recommended that spinach or amaranth can be selected as a representative crop of leaf vegetables in studying systemic fungicide, insecticides, and herbicides with similarity as metalaxyl, fluazifop-P-butyl, chlorpyrifos, and lambda-cyhalothrin.

Keywords:

metalaxyl; fluazifop-P-butyl; chlorpyrifos; lambda-cyhalothrin; leaf vegetables; representative crop; residues