Residue and adsorptive capacity of paraquat in orchard soils

우리나라 과수원 토양의 Paraquat 잔류와 흡착능

  • Chun, Jae-Chul (Division of Applied Biotechnology, Chonbuk National University) ;
  • Kim, Sung-Eun (Division of Applied Biotechnology, Chonbuk National University) ;
  • Park, Nam-Il (Division of Applied Biotechnology, Chonbuk National University) ;
  • Lim, Sung-Jin (Division of Applied Biotechnology, Chonbuk National University)
  • 전재철 (전북대학교 응용생물공학부) ;
  • 김성은 (전북대학교 응용생물공학부) ;
  • 박남일 (전북대학교 응용생물공학부) ;
  • 임성진 (전북대학교 응용생물공학부)
  • Published : 1998.12.30

Abstract

Soil residues of paraquat (1,1-dimethyl-4,4-dipyridinium dichloride) were determined in apple, pear, grape, and peach orchards for which 15 sites each were selected randomly from the corresponding large-scale production area throughout the country. Strong adsorption capacity measured using wheat bioassay (paraquat concentration required to reduce 50% root growth of wheat, SAC-WB) was also investigated on the orchard soils and the paraquat residue level was calculated against total SAC-WB values (SAC-WB value + paraquat residue). Average bound residue of paraquat on the 60 sites was 6.9 ppm, while paraquat residue in apple orchard reached 20.2 ppm which was the highest among the orchards and was almost double as compared with those in the other three orchards. Loosely bound residue of paraquat determined on the bound residue high top five soils occurred less than 0.5 ppm detection limit. Average SAC-WB value was 276.1 ppm and there were no any correlations between the SAC-WB value and clay content, organic matter content, and cation exchange capacity of the orchard soils. Paraquat residue level of the orchard soils against total SAC-WB recorded 2.43%.