Title: Spinach or Amaranth Contains Highest Residue of Metalaxyl, Fluazifop-P-butyl, Chlorpyrifos, and Lambda-cyhalothrin on Six Leaf Vegetables upon Open Field Application
Abstract: 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 0.001–0.01 mg kg–1 for all samples, and the average recoveries of all pesticides ranged from 67.6 to 119.1% at spiked levels of 0.01–0.1 mg kg–1. In supervised field trials, the half-lives of metalaxyl, fluazifop-P-butyl, chlorpyrifos, and lambda-cyhalothrin were in the range of 1.11–3.79 days, 1.11–2.27 days, 1.13–5.17 days, and 1.77–6.24 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.
Publication Year: 2013
Publication Date: 2013-02-22
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 34
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