Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Residue Patterns and Biological Half-lives of Pyridalyl and Fluopicolide in Watermelon

수박 중 및 Pyridalyl 및 Fluopicolide의 잔류 특성 및 생물학적 반감기 산출

  • 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)
  • 박지수 (원광대학교 농식품융합대학 생물환경화학과) ;
  • 양승현 (원광대학교 농식품융합대학 생물환경화학과) ;
  • 최 훈 (원광대학교 농식품융합대학 생물환경화학과)
  • Received : 2017.02.10
  • Accepted : 2017.03.24
  • Published : 2017.03.31
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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.

본 연구는 수박 중 pyridalyl 및 fluopicolide의 경시적 잔류양상을 살펴보고 생산단계 잔류허용기준 설정을 위한 생물학적 반감기를 산출하고자 수행되었다. 두 시험약제를 안전사용기준에 따라 두 포장지역에서 각각 살포한 후 포장 1에서는 10일간 포장 2에서는 20일간 일자별 수박 시료를 채취하여 각각의 잔류분을 HPLC/UVD로 분석하였다. 두 시험농약의 분석정량한계는 각각 0.05 mg/kg, 0.02 mg/kg이었으며, 회수율은 81.2~90.5% 수준이었고 시료 중 시험농약은 43~47일간 안정하였다. 수박 중 초기 잔류량은 pyridalyl이 0.12~0.16 mg/kg, fluopicolide은 0.23~0.24 mg/kg이었으며, 모든 포장내에서 농약잔류허용기준보다 낮은 수준이었다. 수박 중 pyridalyl의 생물학적 반감기는 포장 1에서 26.9일, 포장 2에서 17.9일 이었으며, fluopicolide의 생물학적 반감기는 포장 1에서 16.6일, 포장 2에서 94.2일이었다. 수박의 pyridalyl 및 fluopicolide의 수확 10일 전 생산단계 잔류허용기준은 각각 0.21 mg/kg, 1.03 mg/kg이었으며 재배기간 중 두 시험약제 모두 매우 낮은 잔류소실 경향을 보였다.

Keywords

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