Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Photodegradation of Endosulfan alpha, beta, and sulfate in Aqueous Solution by UV Irradiation Only

자외선 조사에 의한 수용액 중에 함유되어 있는 엔도설판 alpha, beta, sulfate의 광분해

  • Ryoo, Keon-Sang (Department of Applied Chemistry, Andong National University) ;
  • Kim, Mi-Hyang (Department of Applied Chemistry, Andong National University) ;
  • Lee, Hwa-Sung (Gyeongbuk Government Public Institute Health & Environment) ;
  • Hwang, Hyun-Gick (Agricultural Technology & Extension Center)
  • 유건상 (국립 안동대학교 응용화학과) ;
  • 김미향 (국립 안동대학교 응용화학과) ;
  • 이화성 (경상북도 보건환경연구원) ;
  • 황현직 (경북의성군 농업기술센터)
  • Published : 2006.11.30
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Abstract

Photodegradation of endosulfan alpha, beta, and sulfate known as the most toxic substance among organochlorine pesticides by UV irradiation was studied at experimental conditions such as different pH aqueous solution and reaction time. The initial concentration of endosulfan alpha, beta, and sulfate in aqueous solution was 500 ppb, respectively. The experiment of photodegradation was conducted in a quartz reactor equipped with a low pressure mercury lamp (100 W, 240 nm). The samples were withdrawn from the photo reactor at intervals of 0, 10 min, 30 min, 1 hr, 2 hr, and 4 hr. Endosulfan sulfate was never hydrolyzed and photodegraded in wide range of pH. At pH 5 and reaction time (240 min), endosulfan alpha was photodegraded up to 67%. Both endosulfan alpha and beta were started to photodegrade at pH 6.5 with the lapse of time, resulting in approximately 99.9% and 87.2% of photodegradation efficiency, respectively. Furthermore, at pH 9, endosulfan alpha and beta was partially hydrolyzed and photodegraded to 99.5% at 120 min of reaction time. During the photolysis, any photo-products of endosulfan alpha, beta, and sulfate were not observed.

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References

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