Title page for ETD etd-05252004-122641

Type of Document Master's Thesis
Author Rule, Krista Lynn
Author's Email Address krule@vt.edu
URN etd-05252004-122641
Title The Mechanisms, Products, and Kinetics of Triclosan-Free Chlorine Reactions
Degree Master of Science
Department Environmental Engineering
Advisory Committee
Advisor Name Title
Vikesland, Peter J. Committee Chair
Edwards, Marc A. Committee Member
Little, John C. Committee Member
  • Chlorophenoxyphenols
  • Pharmaceutical and Personal Care Products
  • Triclosan
  • Free Chlorine
  • Chlorophenols
Date of Defense 2004-05-24
Availability restricted
The kinetics, products, and reaction pathways of triclosan/free chlorine reactions were investigated for the pH range 3.5-11. Although pH dependent speciation occurs in both triclosan and free chlorine, only the reaction between HOCl and the phenolate-triclosan was found to play a significant role in the kinetics. The second order rate constant for the reaction between phenolate-triclosan and HOCl was found to be 5.40 (±1.82) × 103 M-1s-1. Three chlorinated triclosan intermediates were tentatively identified based on mass spectral analysis. Additionally, 2,4-dichlorophenol, 2,4,6-trichlorophenol, and chloroform formed under excess free chlorine conditions. The majority of the chloroform formed during the reactions does not form via 2,4-dichlorophenol and 2,4,6-trichlorophenol oxidation. Therefore, the majority of chloroform is likely formed via the oxidation of triclosan’s phenolic ring. Based on the identified products, a reaction pathway was proposed for the oxidation of triclosan in the presence of free chlorine.

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