Dissipation and Removal of the Etofenprox Residue during Processing in Spring Onion

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• 作者：Kyu-Won Hwang ; Woo-Suk Bang ; Hyeong-Wook Jo ; Joon-Kwan Moon
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2015
• 出版时间：August 5, 2015
• 年：2015
• 卷：63
• 期：30
• 页码：6675-6680
• 全文大小：276K
• ISSN：1520-5118

文摘

The dissipation and removal of the etofenprox residue was studied in spring onion grown under greenhouse conditions. Samples of spring onion were collected at 0, 1, 2, 4, 6, 8, 10, 12, and 14 days after last application, and removal rates of etofenprox by washing and drying processes were measured. Samples were extracted with acetone and partitioned with dichloromethane. The dichloromethane layer was then concentrated, cleaned up with florisil column chromatography, and analyzed with high-performance liquid chromatography鈥搖ltraviolet detector (HPLC鈥揢VD). At the fortification levels of 0.5, 1.0, and 10 mg/kg, recoveries ranged from 92.0 to 107.7%, with a coefficient of variation of 4.3鈥?.9% (n = 3). The method limit of quantification (MLOQ) was found to be 0.05 mg/kg in spring onion. The half-lives of etofenprox in spring onion were found to be 9.5 and 7.9 days, at the single or double application rates. Removal rates of etofenprox were 21.6鈥?3.9 and 66.6鈥?8.5% by various washing or drying processes, respectively.