Leaching behaviour of the herbicide mefenacet in the soil columns

토양 column중 제초제 mefenacet의 용탈

  • Kim, Sung-Min (Research center, CropScience Korea Ltd.) ;
  • Kwon, Jeong-Wook (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Ahn, Ki-Chang (Department of Agricultural Chemistry, Chungbuk National University) ;
  • Cho, Il-Kyu (Research center, CropScience Korea Ltd.) ;
  • Kyung, Kee-Sung (Department of Pesticide Safety, National Institute of Agricultural Science & Technology) ;
  • Lee, Jae-Koo (Department of Agricultural Chemistry, Chungbuk National University)
  • 김성민 (크롭사이언스 코리아(주) 기술연구소) ;
  • 권정욱 (충북대학교 농과대학 농화학과) ;
  • 안기창 (충북대학교 농과대학 농화학과) ;
  • 조일규 (크롭사이언스 코리아(주) 기술연구소) ;
  • 경기성 (농업과학기술원 농약안전성과) ;
  • 이재구 (충북대학교 농과대학 농화학과)
  • Published : 2003.09.30

Abstract

The leaching behaviour of [aniline-$^{14}C$]mefenacet in soil was investigated using glass columns (5 cm I.D. $\times$ 30 cm. H) packed with two types of soils with different physicochemical properties. $^{14}C$-Mefenacet (8.33 kBq) and mefenacet (in total, 1.05 mg/kg) were treated onto soil columns and rice plants (Oryza sativa L.) were grown for 17 weeks on these columns. Leachates from the columns were collected at the rate of 122.5 mL per week. $^{14}C$-Activities leached from soil A (OM, 3.1%; CEC, 86 mmol(+)/kg; texture, loam) columns with and without rice plants were 1.95 and 4.19% of the originally applied, whereas those from soil B (OM, 1.3%; CEC, 71 mmol(+)/kg; texture, loam) were 2.69 and 7.05%, respectively. These results indicated that larger amounts of $^{14}C$ were percolated from soil B with less organic matter and from the columns without vegetation. $^{14}C$-Activities absorbed by rice plants from soil A and B were 8.95 and 8.47%, respectively, most of which remained in the root and shoot excluding unhulled grains and ears without grains. $62\sim73%$ of the originally applied $^{14}C$ remained in the depth of $0\sim5cm$ in soil. The mass balance indicated that the losses by volatilization and/or mineralization amounted to $3.4\sim9.2%$ of the originally applied. $^{14}C$-Radioactivities in the aqueous phase of the leachates ranged from 59.4 to 97.7% of the radioactivities in leachates, showing the fast transformation of mefenacet to the polar metabolites.

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