Decomposition rate of iprobenfos, isoprothiolane, and diazinon by some environmental factors in aqueous systems

몇가지 수중 환경요인에 의한 iprobenfos, isoprothiolane 및 diazinon의 분해속도

  • Park, Byung-Jun (National Institute of Agricultural Science and Technology. RDA) ;
  • Choi, Ju-Hyun (National Institute of Agricultural Science and Technology. RDA) ;
  • Lee, Byung-Moo (National Institute of Agricultural Science and Technology. RDA) ;
  • Im, Geon-Jae (National Institute of Agricultural Science and Technology. RDA) ;
  • Kim, Chan-Sub (National Institute of Agricultural Science and Technology. RDA) ;
  • Park, Kyung-Hun (National Institute of Agricultural Science and Technology. RDA)
  • 박병준 (농업과학기술원 농약안전성과) ;
  • 최주현 (농업과학기술원 농약안전성과) ;
  • 이병무 (농업과학기술원 농약안전성과) ;
  • 임건재 (농업과학기술원 농약안전성과) ;
  • 김찬섭 (농업과학기술원 농약안전성과) ;
  • 박경훈 (농업과학기술원 농약안전성과)
  • Published : 1998.09.30

Abstract

Three pesticides for paddy rice, iprobenfos, isoprothiolane, and diazinon were examined on some environmental factors, their hydrolysis, microbial degradation, and photolysis in aqueous systems. Iprobenfos was mainly degraded by microorganisms and its half-life was 5.7 days at $28^{\circ}C$ in aqueous systems. Hydrolysis of iprobenfos was accelerated by the higher temperature, but its photodegradation was accelerated by the lower pH. Isoprothiolane was rapidly decomposed by two factors, microorganisms and sunlight. The half-life of isoprothiolane by sunlight was 91 days at pH 9.0, while it was 13 days at pH 4.0 and 16 days at pH 7.2. However, it was shortened under low pH condition. In aqueous system, diazinon was degraded by all of three factors and its degradation rate was remarkably accelerated by acidic solution. Main degradation factors of iprobenfos, isoprothiolane, and diazinon in the aqueous system were investigated by microbial degradation, photolysis, and hydrolysis, respectively. The strains of microbial degradation for iprobenfos, isoprothiolane, and diazinon in the aqueous environment were identified as Pseudomonas putida, Alcaligenes xylosoxydans ss, Klebsiella planticola/ornithinllytica, respectively. The similarity rates of identity were $54.8{\sim}86.2%$ with biolog-system.