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Ozonation of Microcystins: Kinetics and Toxicity Decrease.

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  • 1School of Chemical and Biological Engineering, Institute of Chemical Process (ICP) , Seoul National University , 1 Gwanak-ro , Gwanak-gu, Seoul 08826 , Republic of Korea.

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Ozonation effectively removes microcystins (MCs) and reduces their toxicity by reacting with ozone (O3) and hydroxyl radicals (•OH). However, MC-YR and MC-LW show incomplete Adda moiety destruction, impacting toxicity reduction.

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Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies
  • Toxicology

Background:

  • Microcystins (MCs) are potent cyanotoxins contaminating water sources.
  • Ozonation is a common water treatment method, but its efficacy against MCs requires detailed kinetic and toxicological assessment.
  • Understanding the degradation pathways and residual toxicity is crucial for public health protection.

Purpose of the Study:

  • To investigate the kinetics of ozonation for six common microcystins (MCs).
  • To evaluate the reduction in MCs' toxicity following ozonation.
  • To identify oxidation products and understand their contribution to residual toxicity.

Main Methods:

  • Determined second-order rate constants for reactions of six MCs with ozone (O3) and hydroxyl radicals (•OH).
  • Calculated activation energies for these reactions.
  • Utilized a kinetic model to predict MC removal and employed liquid chromatography-mass spectrometry (LC-MS) to identify oxidation products.

Main Results:

  • Rate constants for O3 and •OH reactions with MCs were determined, showing varying reactivity.
  • Ozonation significantly reduced MC hepatotoxicity, with most MCs showing concurrent concentration and toxicity decrease.
  • MC-YR and MC-LW exhibited a toxicity gap due to incomplete Adda moiety degradation, with some oxidation products retaining the moiety.

Conclusions:

  • Ozonation is effective in degrading various microcystins and reducing their toxicity.
  • The Adda moiety's incomplete destruction in MC-YR and MC-LW necessitates further investigation for complete detoxification.
  • Kinetic data and product identification provide valuable insights for optimizing ozonation processes in water treatment.