Persistence and degradation of herbicide molinate in paddy-soil environment

논토양 환경 중 제초제 molinate의 잔류성과 분해특성

  • Park, Byung-Jun (National Institute of Agricultural Science & Technology, RDA) ;
  • Park, Hyeon-Ju (National Institute of Agricultural Science & Technology, RDA) ;
  • Lee, Byung-Moo (National Institute of Agricultural Science & Technology, RDA) ;
  • Ihm, Yang-Bin (National Institute of Agricultural Science & Technology, RDA) ;
  • Choi, Ju-Hyeon (National Institute of Agricultural Science & Technology, RDA) ;
  • Ryu, Gab-Hee (National Institute of Agricultural Science & Technology, RDA)
  • 박병준 (농업과학기술원 농산물안전성부) ;
  • 박현주 (농업과학기술원 농산물안전성부) ;
  • 이병무 (농업과학기술원 농산물안전성부) ;
  • 임양빈 (농업과학기술원 농산물안전성부) ;
  • 최주현 (농업과학기술원 농산물안전성부) ;
  • 류갑희 (농업과학기술원 농산물안전성부)
  • Published : 2005.03.31

Abstract

The herbicide molinate has been detected with high frequency in the main river during the growing season in Korea. To elucidate the exposure of molinate in agricultural environment, the persistence and the degradation characteristics of molinate were investigated in paddy ecosystems. The half-lives of molinate were 4.1 days with soil aquatic system, and 4.2 days in only aquatic system. Initial dissipation rate of molinate in water was greater with soil aquatic system than that of only aquatic system. Photolysis of molinate was occurred about 31.0% of molinate treated in pure water, when irradiated at 5,530 $J/cm^2$ by the xenon lamp, but its hydrolysis was stable. For the accelerated photolysis of molinate in aqueous solution, several photosensitizers were screened, showing that the hydroperoxide($H_2O_2$) and acetone were prominent among the chemical tested. When hydroperoxide and zinkoxide(ZnO) were used as photosensitizer, their photolysis were accelerated greater than 98% and 58% in aqueous solution, respectively. Elution rate of molinate as granular formulations in aqueous system was more than 90% in 30 hour at $35^{\circ}C$. Molinate concentration pattern in paddy water was rapidly decrease from treatment till 7 days in paddy rice field and its half-lives were 3.7 days($Y=1.9258{\times}e^{-0.1865X}$(r=-0.9402)).

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