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Creators/Authors contains: "von Gunten, Urs"

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  1. ; ; ; (, Water Research)
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  2. ; ; ; ; (, Environmental Science: Water Research & Technology)
    This study focuses on the effects of ozonation on the optical and photochemical properties of dissolved organic matter (DOM). Upon ozonation, a decrease in light absorption properties of DOM was observed concomitantly with a large increase in singlet oxygen ( 1 O 2 ) and hydroxyl radical (˙OH) quantum yields ( Φ 1O2 and Φ ˙OH , respectively). The decrease in absorbance was linked to the reaction of DOM chromophores with ozone and ˙OH, formed as a secondary oxidant, while the increase in Φ 1O2 and Φ ˙OH are linked to the formation of quinone-like moieties from the reaction of ozone with phenolic DOM moieties. Investigations using benzoic acid as a ˙OH probe and methanol as a ˙OH scavenger indicated that not only is ˙OH formed, but that other hydroxylating species (˙OH-like) are also produced upon DOM photo-irradiation. 
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