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Chemical oxidation of dissolved organic matter by chlorine dioxide, chlorine, and ozone: effects on its optical and antioxidant properties.
Environ Sci Technol. 2013 Oct 01; 47(19):11147-56.ES

Abstract

In water treatment dissolved organic matter (DOM) is typically the major sink for chemical oxidants. The resulting changes in DOM, such as its optical properties have been measured to follow the oxidation processes. However, such measurements contain only limited information on the changes in the oxidation states of and the reactive moieties in the DOM. In this study, we used mediated electrochemical oxidation to quantify changes in the electron donating capacities (EDCs), and hence the redox states, of three different types of DOM during oxidation with chlorine dioxide (ClO2), chlorine (as HOCl/OCl(-)), and ozone (O3). Treatment with ClO2 and HOCl resulted in comparable and prominent decreases in EDCs, while the UV light absorbances of the DOM decreased only slightly. Conversely, ozonation resulted in only small decreases of the EDCs but pronounced absorbance losses of the DOM. These results suggest that ClO2 and HOCl primarily reacted as oxidants by accepting electrons from electron-rich phenolic and hydroquinone moieties in the DOM, while O3 reacted via electrophilic addition to aromatic moieties, followed by ring cleavage. This study highlights the potential of combined EDC-UV measurements to monitor chemical oxidation of DOM, to assess the nature of the reactive moieties and to study the underlying reaction pathways.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Wenk J
Eawag, Swiss Federal Institute of Aquatic Science and Technology CH-8600, Dübendorf, Switzerland.
Aeschbacher M
No affiliation info available
Salhi E
No affiliation info available
Canonica S
No affiliation info available
von Gunten U
No affiliation info available
Sander M
No affiliation info available

MeSH

AntioxidantsBenzopyransChlorineChlorine CompoundsHumic SubstancesOxidation-ReductionOxidesOzoneWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23978074

Citation

Wenk, Jannis, et al. "Chemical Oxidation of Dissolved Organic Matter By Chlorine Dioxide, Chlorine, and Ozone: Effects On Its Optical and Antioxidant Properties." Environmental Science & Technology, vol. 47, no. 19, 2013, pp. 11147-56.
Wenk J, Aeschbacher M, Salhi E, et al. Chemical oxidation of dissolved organic matter by chlorine dioxide, chlorine, and ozone: effects on its optical and antioxidant properties. Environ Sci Technol. 2013;47(19):11147-56.
Wenk, J., Aeschbacher, M., Salhi, E., Canonica, S., von Gunten, U., & Sander, M. (2013). Chemical oxidation of dissolved organic matter by chlorine dioxide, chlorine, and ozone: effects on its optical and antioxidant properties. Environmental Science & Technology, 47(19), 11147-56. https://doi.org/10.1021/es402516b
Wenk J, et al. Chemical Oxidation of Dissolved Organic Matter By Chlorine Dioxide, Chlorine, and Ozone: Effects On Its Optical and Antioxidant Properties. Environ Sci Technol. 2013 Oct 1;47(19):11147-56. PubMed PMID: 23978074.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chemical oxidation of dissolved organic matter by chlorine dioxide, chlorine, and ozone: effects on its optical and antioxidant properties. AU - Wenk,Jannis, AU - Aeschbacher,Michael, AU - Salhi,Elisabeth, AU - Canonica,Silvio, AU - von Gunten,Urs, AU - Sander,Michael, Y1 - 2013/09/16/ PY - 2013/8/28/entrez PY - 2013/8/28/pubmed PY - 2014/5/6/medline SP - 11147 EP - 56 JF - Environmental science & technology JO - Environ Sci Technol VL - 47 IS - 19 N2 - In water treatment dissolved organic matter (DOM) is typically the major sink for chemical oxidants. The resulting changes in DOM, such as its optical properties have been measured to follow the oxidation processes. However, such measurements contain only limited information on the changes in the oxidation states of and the reactive moieties in the DOM. In this study, we used mediated electrochemical oxidation to quantify changes in the electron donating capacities (EDCs), and hence the redox states, of three different types of DOM during oxidation with chlorine dioxide (ClO2), chlorine (as HOCl/OCl(-)), and ozone (O3). Treatment with ClO2 and HOCl resulted in comparable and prominent decreases in EDCs, while the UV light absorbances of the DOM decreased only slightly. Conversely, ozonation resulted in only small decreases of the EDCs but pronounced absorbance losses of the DOM. These results suggest that ClO2 and HOCl primarily reacted as oxidants by accepting electrons from electron-rich phenolic and hydroquinone moieties in the DOM, while O3 reacted via electrophilic addition to aromatic moieties, followed by ring cleavage. This study highlights the potential of combined EDC-UV measurements to monitor chemical oxidation of DOM, to assess the nature of the reactive moieties and to study the underlying reaction pathways. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/23978074/Chemical_oxidation_of_dissolved_organic_matter_by_chlorine_dioxide_chlorine_and_ozone:_effects_on_its_optical_and_antioxidant_properties_ L2 - https://doi.org/10.1021/es402516b DB - PRIME DP - Unbound Medicine ER -