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

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

Research output: Contribution to journalArticlepeer-review

201 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


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

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