Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Adsorption Characteristics of the Herbicide Mefenacet in Soil

제초제 Mefenacet의 토양 중 흡착 특성

  • Kim, Sung-Min (Research Center, CropScience Korea Ltd) ;
  • Cho, Il-Kyu (Research Center, CropScience Korea Ltd) ;
  • Lee, Eun-Young (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Park, Sun-Hwa (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Lee, Jae-Koo (Department of Agricultural Chemistry, Chungbuk National University)
  • 김성민 (크롭사이언스 코리아㈜ 부설연구소) ;
  • 조일규 (크롭사이언스 코리아㈜ 부설연구소) ;
  • 이은영 (충북대학교 농화학과) ;
  • 박선화 (충북대학교 농화학과) ;
  • 이재구 (충북대학교 농화학과)
  • Published : 2003.03.31
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Abstract

The adsorption characteristics of [$^{14}C$] mefenacet were investigated with six types of soil collected from different locations. The equilibrium time for adsorption was five hours. The adsorption coefficient(Kf) of Namwon series (volcanic ash soil) showed the highest value of 89.2 while Daejeon series (loamy sand) showed the lowest value of 2.37. The Kf values decreased in order of silty clay loam > silty loam > loamy sand > sandy loam, and the effect of soil properties on the adsorption of mefenacet in soil increased in order of clay mineral < CEC < organic matter. No significant effect was observed by the change of soil pH. The ground water ubiquity scores (GUS index) were $1.20{\sim}1.77$ in three types of soil while $1.81{\sim}2.42$ in the others, indicating that the former group belonged to nonleachers and the latter group to the transitional. Mefenacet in the test soil series seemed to have low possibility of contaminating ground water.

물리화학적 특성에 따른 mefenact의 토양 중 흡착 특성을 알아보고자 전국을 대표하는 6개 지역 토양을 채취하여 흡착실험을 하였다. 흡착 평형 도달 시간은 5시간이었고 각 토양에 대한 흡착실험 결과 화산회토(미사질식양토)인 제주 남원통의 흡착계수 $K_f$ 값이 89.2로서 가장 높았고 사양토인 대전통은 2.37으로 가장 낮았다. 각 토양에 대한 흡착계수의 크기는 미사질식양토 2종>미사질양토 1종>양질사토 1종>사양토 2종 순이었으며, mefenacet의 토양 흡착에 미치는 토양의 특성은 토양유기물>양이온치환용량점토광물 순이었고 토양 pH는 크게 영향을 미치지 않았다. 한편 흡착 분배계수와 토양잔류 반감기를 이용하여 유기화합물의 지하수 오염 가능성을 평가하는 수단으로 사용되는 GUS 값을 산출한 결과 3개 지역 토양은 $1.20{\sim}1.77$이었고 나머지 3개 토양은 $1.87{\sim}2.42$로서 전자는 비용탈성(nonleacher), 그리고 후자는 전이용탈성(transitional)으로 분류되어 mefenacet은 6개 지역 토양에서는 지하수 오염 가능성이 매우 희박한 것으로 판단되었다.

Keywords

References

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