A Study on the Degradation Mechanism of Diazinon and the Acute Toxicity Assessment in Photolysis and Photocatalysis

광반응과 광촉매 반응을 이용한 Diazinon 농약의 분해 기전과 독성 평가에 관한 연구

  • Oh, Ji-Yoon (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Kim, Moon-Kyung (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Son, Hyun-Seok (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Zoh, Kyung-Duk (Department of Environmental Health, School of Public Health, Seoul National University)
  • 오지윤 (서울대학교 보건대학원 환경보건학과) ;
  • 김문경 (서울대학교 보건대학원 환경보건학과) ;
  • 손현석 (서울대학교 보건대학원 환경보건학과) ;
  • 조경덕 (서울대학교 보건대학원 환경보건학과)
  • Published : 2008.11.30

Abstract

Diazinon is a phosphorothiate insecticide widely used in the world including Korea. This study investigates the feasibility of photolysis and photocatalysis processes for the degradation of diazinon in water. Both photolysis and photocatalysis reactiosn were effective in degrdading diazinon, however lower TOC removals were achieved. In case of photocatalysis, approximately 40% of nitrogen from diazinon was recovered as NO$_3^-$, and less than 5% of phosphorus as PO$_4{^{3-}}$. However, the sulfur in diazinon molecule was completely recovered to SO$_4{^{2-}}$ from photocatalysis reaction, and the recovery from photolysis was 50%, indicating that P=S bond easily breaks first during photolysis and photocatalysis. The poor recoveries of ionic byproducts and TOC from photolysis and photocatalysis indicate the presence of other organic intermediates during reactions. The formation of organic intermediates were identified during reactions using GC/MS and LC/MS/MS, and the main degradation products were diazoxon, and 2-isopropyl-4-methyl-6-hydroxypyrimidine (IMP), respectively. Finally, the acute 48-hr toxicity test using Daphnia magna were employed to measure the toxicity reduction during photocatalysis of degradation. The results showed that the toxicity increased until 180 min of the photocatalysis reaction (from EC$_{50}$ (%) of 69.6 to 13.2%), however, acute toxicity completely disappeared (>100%) after 360 min. The toxicity results showed that the intermediates from photocatalysis such as diazoxon were more toxic than diazinon itself, however these intermediates can be degraded or mineralized with further reaction.

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