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http://dx.doi.org/10.5338/KJEA.2017.36.1.08

Residue Patterns and Biological Half-lives of Pyridalyl and Fluopicolide in Watermelon  

Park, Ji-Su (Department of Bio-Environmental Chemistry, College of Agriculture and Food Sciences, Wonkwang University)
Yang, Seung-Hyun (Department of Bio-Environmental Chemistry, College of Agriculture and Food Sciences, Wonkwang University)
Choi, Hoon (Department of Bio-Environmental Chemistry, College of Agriculture and Food Sciences, Wonkwang University)
Publication Information
Korean Journal of Environmental Agriculture / v.36, no.1, 2017 , pp. 50-56 More about this Journal
Abstract
BACKGROUND: The present study was carried out to identify the residue patterns of insecticide pyridalyl and fungicide fluopicolide in watermelon and calculate the biological half-lives for establishing the pre-harvest residue limits (PHRLs). METHODSANDRESULTS:The watermelon samples for residue analysis were harvested 7 times during 0~10 days (Field 1) and 0~20 days (Field 2) after treatment of pesticides on watermelon in two different fields at the recommended dose, respectively. The residue analysis was conducted with HPLC/UVD. The method limit of quantitation (MLOQ) were set at 0.05 and 0.02 mg/kg, respectively, and overall mean recoveries were 81.2~90.5% for pyridalyl and fluopicolide. The residues in sample were stable for 43~47 days. The initial residue amount in field 1 and 2 were 0.12~0.16 mg/kg for pyridalyl and 0.23~0.24 mg/kg for fluopicolide, which were below maximum residue limit (MRL). The biological half-lives in field 1 and 2 were 26.9 and 17.9 days for pyridalyl and 16.6 and 94.2 days for fluopicolide, respectively. CONCLUSION: The PHRL for watermelon were estimated as 0.21 and 1.03 mg/kg for pyridalyl and flopicolide at 10 days before harvesting. The residue patterns of pyridalyl and fluopicolide were characterized by a very slow decrease of residue levels in watermelon.
Keywords
Biological half-life; Fluopicolide; Pyridalyl; Residue pattern,Watermelon;
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Times Cited By KSCI : 11  (Citation Analysis)
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