The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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Leaching Characteristics of the Endocrine Disruptor-suspected Pesticides in Upland Soil

내분비계장애추정농약의 밭토양 중 용탈 특성

  • Noh, Hyun Ho (Department of Environmental and Biological Chemistry, College of Agriculture, Life and Environmental Sciences, Chungbuk National University) ;
  • Lee, Jae Yun (Department of Environmental and Biological Chemistry, College of Agriculture, Life and Environmental Sciences, Chungbuk National University) ;
  • Lee, Kwang Hun (Residue Technical Research Institute, Dong Bang Argo Corp.) ;
  • Park, Hyo Kyoung (Environmental Toxicology Division, Toxicological Research Center, Hoseo University) ;
  • Kyung, Kee Sung (Department of Environmental and Biological Chemistry, College of Agriculture, Life and Environmental Sciences, Chungbuk National University)
  • 노현호 (충북대학교 농업생명환경대학 환경생명화학과) ;
  • 이재윤 (충북대학교 농업생명환경대학 환경생명화학과) ;
  • 이광헌 ((주)동방아그로 기술연구소) ;
  • 박효경 (호서대학교 안전성평가센터) ;
  • 경기성 (충북대학교 농업생명환경대학 환경생명화학과)
  • Received : 2013.09.02
  • Accepted : 2013.09.20
  • Published : 2013.09.30
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Abstract

This experiment was carried out to estimate leaching potential of thirteen endocrine disruptor-suspected pesticides in upland soils using soil columns (5 cm I.D. ${\times}$ 35 cm H.) packed with soil A (sandy loam) and soil B (loam). When 12.6 mL of water, average precipitation in Cheongju area during the period from June to August, 2001-2010, was percolated through soil column packed with soil A every day for 21 days, no pesticides were detected from leachate, with the exception of metribuzin which was detected with negligible. Also, when 2 L of water was percolated consecutively five times through soil columns packed with soil A and B, irrespective of soil types, cypermethrin, endosulfan, fenvalerate, parathion and trifluralin, which were very low water solubilities and high soil $K_{oc}s$, were not detected from leachate and were distributed mostly in the depth of 0-5 cm, representing that water solubility and soil $K_{oc}$ are major contributing factors to their leaching behavior. Despite high average leaching rates in carbaryl and methomyl, actual possibilities of ground water contamination in the agricultural environment by them would be very low, considering that the negligible amount of pesticide was percolated through a lysimeter with an undisturbed soil core simulating the field conditions, while most of pesticide was percolated through a soil column with the disturbed soil profile.

내분비계장애추정농약의 밭토양 중 용탈특성을 구명하기 위하여 토양칼럼(내경 5 cm, 높이 35 cm)을 이용하여 alachlor 등 13종 농약의 용탈시험을 수행하였다. 토양 A를 충전한 칼럼에 2001년부터 청주지역의 6-8월까지 10년간 평균 일일강수량인 12.6 mL를 매일 용탈시켜 3일 간격으로 모으는 방법으로 3주간 용탈시켰을 때 용탈수에서 metribuzin이 극미량 검출된 것을 제외하고 모든 시험농약은 용탈되지 않았다. 그러나 토양 A와 B를 충전한 칼럼에 2 L의 증류수를 연속 5회 용탈시키는 방법으로 시험하였을 때 수용해도가 낮고 토양 흡착성이 큰 cypermethrin, endosulfan, fenvalerate, parathion, trifluralin은 토양 종류에 관계없이 용탈수에서 검출되지 않았고 주로 토층 0-5 cm 부위에 분포하여 시험농약의 물에 대한 용해도와 토양에 대한 흡착특성의 영향 때문인 것으로 나타났다. Carbaryl과 methomyl이 다른 농약에 비해 용탈율이 높았으나 토층이 자연상태의 농경지와 다른 토양 충전 칼럼에서는 처리 농약의 대부분이 용탈된 반면 실제포장과 유사한 조건의 lysimeter 실험에서는 극미량의 농약이 용탈되었다는 선행연구의 연구결과 등을 고려하면 지하수 오염 가능성은 낮을 것으로 판단되었다.

Keywords

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