Environmental Engineering Research

  • 제18권1호
  • /
  • Pages.29-35
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  • 2013
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  • 1226-1025(pISSN)
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  • 2005-968X(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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Formation of Reactive Species Enhanced by H2O2 Addition in the Photodecomposition of N-Nitrosodimethylamine (NDMA)

  • Kwon, Bum Gun (Department of Bioenvironmental and Chemical Engineering, Chosun College of Science and Technology) ;
  • Kim, Jong-Oh (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Kwon, Joong-Keun (Department of Bioenvironmental and Chemical Engineering, Chosun College of Science and Technology)
  • 투고 : 2012.11.29
  • 심사 : 2013.01.26
  • 발행 : 2013.03.30
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초록

This study noted that the actual mechanism of N-nitrosodimethylamine (NDMA) photodecomposition in the presence of $H_2O_2$ is missing from the previous works. This study investigated a key unknown reactive species (URS) enhanced by the addition of $H_2O_2$ during the photolysis of NDMA with $H_2O_2$, not hydroxyl radicals. In order to provide experimental evidences in support of URS formation, we have mainly used p-nitrosodimethylaniline, methanol, and benzoic acid as well-known probes of ${\cdot}OH$ in this study. Both loss of PNDA and formation of hydroxybenzoic acids were dependent on NDMA concentrations during the photolysis in a constant concentration of $H_2O_2$. In particular, competition kinetics showed that the relative reactivity of an URS was at least identical with ${\cdot}OH$-like reactivity. In addition, the decay of NDMA was estimated to be about 65% by the direct UV light and about 35% by the reactive species or URS generated through the photolysis of NDMA and $H_2O_2$. Therefore, our data suggest that a highly oxidizing URS is formed in the photolysis of NDMA with $H_2O_2$, which could be peroxynitrite ($ONOO^-$) as a potent oxidant by itself as well as a source of ${\cdot}OH$.

키워드

참고문헌

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  5. Elementary reaction-based kinetic model for the fate of N-nitrosodimethylamine under UV oxidation vol.7, pp.10, 2013, https://doi.org/10.1039/d1ew00262g