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KMID : 1156220090350020124
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Journal of Environmental Health Sciences
2009 Volume.35 No. 2 p.124 ~ p.129
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A Study on the Degradation and the Reduction of Acute Toxicity of Simazine Using Photolysis and Photocatalysis
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Kim Mun-Kyung
Oh Ji-Yoon
Son Hyeon-Seok
Zoh Kyung-Duk
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Abstract
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The photocatalysis degradation of simazine, s-triazine type herbicide was carried out using circulating photo reactor systems. In order to search for the effective method to mineralize this compound into environmentally compatible products, this study compared the removal efficiencies of simazine by changing various parameters. First, under the photocatalytic condition, simazine was more effectively degraded than by photolysis and TiO₂ only condition. With photocatalysis, 5 ㎎/ℓ simazine was degraded to approximately 90% within 30 min, and completely degraded after 150 min. Ionic byproducts such as NO₂?, NO₃?, and Cl? were detected from the photocatalysis of simazine, however, the recoveries were poor, indicating the presence of organic intermediates rather than the mineralization of simazine during photocatalysis. Two bioassays using V. fischeri and D. magna were employed to measure the toxicity reduction in the reaction solutions treated by both photocatalysis and photolysis. Simazine and its photocatalysis treated water did not exert any significant toxicity to V. fischeri, marine bacterium. However, the acute toxicity test using D. magna indicates that initial acute toxicity (EC?? = 57.30%) was completely reduced (EC?? = 100%) after 150 min under both photocatalysis and photoysis of simazine. This results indicates that photocatalysis and photolysis of simazine reduced the acute toxicity through mineralization.
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KEYWORD
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simazine, photocatalysis, photolysis, acute toxicity, V.fischeri, D.magna
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