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http://dx.doi.org/10.5338/KJEA.2003.22.2.130

Residue Levels of Chlorpyrifos and Chlorothalonil in Apples at Harvest  

Kim, Young-Sook (Department of Agricultural Chemistry, Kyungpook National University)
Park, Ju-Hwang (Department of Agricultural Chemistry, Kyungpook National University)
Park, Jong-Woo (Department of Agricultural Chemistry, Kyungpook National University)
Lee, Young-Deuk (Department of Agricultural Chemistry, Daegu University)
Lee, Kyu-Seung (Department of Agricultural Chemistry, Chungnam National University)
Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University)
Publication Information
Korean Journal of Environmental Agriculture / v.22, no.2, 2003 , pp. 130-136 More about this Journal
Abstract
An organophosphorus insecticide, chlorpyrifos and an arylnitrile fungicide, chlorothalonil commonly used far apple were subjected to a residual investigation under field conditions to ensure safety of terminal residues at harvest. After pesticides were applied at standard rate in apple tree fer 15 days for chlorpyrifos and 30 days far chlorothalonil, persistence of their residues in apple was investigated by several interval. At harvest, residual concentrations of chlorpyrifos and chlorothalonil in apple were 1.3 and 2.4mg/kg, respectively, and the residue levels were higher than MRL 1.0 mg/kg in Korea. As well fitted by the first-oder kinetics, biological half-lives of the pesticide residues in apple were 9.3 days for chlorpyrifos and 32.2 days for chlorothalonil. During the storage, half-lives of chlorpyrifos and chlorothalonil were 35.0 and 56.3days at room temperature, and 120.7 and 182.8 days at 412, respectively. Distribution of chlorpyrifos residue in flesh, fruit skin and stalk cavity of each apple corresponded to 0.1% 22.8% and 77.1%, respectively. In case of chlorothalonil, residue in flesh, fruit skin and stalk cavity was 4.4%, 10.4% and 85.2%, respectively.
Keywords
chlorpyrifos; chlorothalonil; residue; MRL; biological half-lives;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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