Extraction Method for Paraquat from Soil

토양중 Paraquat의 효과적인 추출방법

  • Kwon, Jin-Wook (Department of Agricultural Chemistry, Chungnam National University) ;
  • Kim, Yong-Se (Central Research Institute, Han-Nong Corporation) ;
  • Choi, Jong-Woo (Kum River Environmental Management Office) ;
  • Lee, Kyu-Seung (Department of Agricultural Chemistry, Chungnam National University)
  • 권진욱 (충남대학교 농과대학 농화학과) ;
  • 김용석 ((주)한농 중앙연구소) ;
  • 최종우 (금강환경관리청) ;
  • 이규승 (충남대학교 농과대학 농화학과)
  • Published : 1997.09.30

Abstract

To develope more effective extraction methods for paraquat in soil, some modification methods were accomplished in two different types of soil. For extraction of tightly bound-paraquat, conc. HCl 70ml were added with different shaking times, and then $H_2SO_4$ reflux were performed for an hour. In this case, 60 minutes shaking were optimum and recovery were increased more $1.09{\sim}1.50$ folds(84.0% in high clay contents soil, but 96.7% in low clay contents soil) and the long-time consuming step, filtration were easily done, with decreasing filtration time were shorter 4.6 folds(ca. $11{\sim}14min.$). than general paraquat analytical method(ca. $55{\sim}65min.$). And only $H_2O_2$ digestion with different volume and refluxing time resulted in recovery increasing. Nevertheless, considering analyst's safety, 30ml of $H_2O_2$ addition and 30 minutes reflux were regarded as optimum condition. Although, Kjeldahl digestion with $H_2O_2$ showed relatively high recovery, it is not significant statistically. For extraction of loosely bound-paraquat, 0.01, 0.1, 1.0, 10.0M of $NH_4Cl$ and of $CaCl_2$ compared with $1.5{\sim}24hr$ of different shaking time. There were no loosely bound residues of paraquat.