Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Residual Pattern of Procymidone and Bifenthrin in Perilla Leaf During the Period of Cultivation and Storage

들깻잎의 재배 및 저장기간 중 Procymidone 및 Bifenthrin의 잔류량변화

  • Ko, Kwang-Yong (Dept. of Agriculture Chemistry, Chungnam National University) ;
  • Lee, Yong-Jae (Dept. of Agriculture Chemistry, Chungnam National University) ;
  • Won, Dong-Jun (Dept. of Agriculture Chemistry, Chungnam National University) ;
  • Park, Hye-Jin (Dept. of Agriculture Chemistry, Chungnam National University) ;
  • Lee, Kyu-Seung (Dept. of Agriculture Chemistry, Chungnam National University)
  • 고광용 (충남대학교 농업생명과학대학 농화학과) ;
  • 이용재 (충남대학교 농업생명과학대학 농화학과) ;
  • 원동준 (충남대학교 농업생명과학대학 농화학과) ;
  • 박혜진 (충남대학교 농업생명과학대학 농화학과) ;
  • 이규승 (충남대학교 농업생명과학대학 농화학과)
  • Published : 2003.03.31
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Abstract

In order to know residual pattern of pesticides and to predict degradation period until below MRL, we experimented with procymidone and bifenthrin for perilla leaf which were the most detected pesticides by NAQS (National Agriculture-product Quality management Service) survey. In this experiment, we sprayed those pesticides 10 days before harvest and analyzed 0, 1, 2, 3, 5, 7, 10 day samples to establish logical equation and to calculate $DT_{50}$. Also degradation patterns of those samples were compared during storage at 4t and 20t. During cultivating period, procymidone residue amount was changed from 79.52 mg/kg (0 day) to 4.2 mg/kg, $DT_{50}$ was 2.65 days by logical-equation, and bifenthrin residue amount was changed from 5.03 mg/kg (0 day) to 0.17 mg/kg, $DT_{50}$ was 2.24 days. During storage period, $DT_{50}$ of procymidone and bifenthrin at $4^{\circ}C$ was 12.23 days and 10.57 days, and at $20^{\circ}C$ was 6.32 days and 8.2 days, respectively.

들깻잎에서 pocymidone과 bifenthrin의 경우 안전사용기준인 약제살포 후 5일에 각각의 농도가 38.16, 1.77 mg/kg이지만 이는 살포 조건과 재배환경에 따른 농약의 초기부착농도가 높은데서 기인한 것이라고 예상되어진다. 앞에서의 결과들로 미루어 볼 때 일반적인 농약의 안전사용기준으로 농약을 처리한다면 최초살포 이후 재배기간에서 5일간 50% 이상이 분해되고 10일 후에는 90%이상이 분해된다. 또한 상온저장 중 $20{\sim}40%$가 분해되며 수돗물 세척에 의해서 만으로도 50%이상이 제거되므로 조리과정을 감안하지 않더라도 초기살포량의 약 90%는 분해 또는 제거되어 안전사용기준에 의거하여 사용한다면 두 약제 모두 MRL이하로 잔류하게 되어 별다른 문제가 없을 것으로 예상되어진다. 하지만 현행법상 수확시점에 그 잔류량을 조사하도록 되어 있으므로 깻잎의 경우 재배가 대부분 하우스에서 이루어짐을 감안한다면 두 약제모두 초기살포시 작물체로의 부착량이 많을 경우에 수확시점에서의 잔류량이 MRL을 상회할 가능성도 있음을 알 수 있었다. 따라서 이에 따른 약제 사용량의 축소나 저농도 약제의 사용, 살포일수의 조정 등에 관한 연구가 필요하다고 본다.

Keywords

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