Photochemical conversion of triclosan to 2,8-dichlorodibenzo-p-dioxin in aqueous solution

Douglas E. Latch, Jennifer L. Packer, William A. Arnold, Kristopher McNeill

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234 Scopus citations


The direct photolysis of triclosan (5-chloro-2-(2,4-dichlorophenoxy) phenol), an antimicrobial additive commonly detected in surface waters, is studied. It is found that 2,8-dichlorodibenzo-p-dioxin (2,8-DCDD) is produced in both buffered and natural (Mississippi River) water with yields ranging from 1 to 12% under a variety of conditions. This result indicates that triclosan is likely converted to 2,8-DCDD in sunlight-irradiated surface waters.

Original languageEnglish (US)
Pages (from-to)63-66
Number of pages4
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number1
StatePublished - May 30 2003

Bibliographical note

Funding Information:
We thank the National Institutes for Water Resources/USGS National Water Quality Competitive Grants Program and the University of Minnesota for support of this work and Kathy Lee (USGS) for helpful discussions.

Copyright 2019 Elsevier B.V., All rights reserved.


  • 2,8-Dichlorodibenzo-p-dioxin
  • Direct photolysis
  • Natural water
  • Photochemical cyclization
  • Triclosan


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