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Triclosan, 5-chloro-2-(2,4 dichlorophenoxy)phenol, is an anti-microbial agent used inmany pharmaceutical and personal care products (PPCPs) such as toothpastes, soaps, anddetergents. Because of its widespread use, significant amounts of triclosan are introducedto wastewater treatment systems. The removal of triclosan during wastewater treatment isdependent on the type of secondary treatment employed. Presumably due to itsincomplete removal during wastewater treatment, triclosan has been detected in 58% ofthe U.S. waterways examined in a recent US Geological Survey study. As with many other PPCPs,triclosan is a phenolic compound. Recent studies have demonstrated that phenols reactwith free chlorine to form disinfection byproducts such as Trihalomethanes. While studies inthe past have examined triclosan-free chlorine interactions, the kinetics of these reactionshave not been investigated. Monochloramine is also commonly used for drinking waterdisinfection. However, the reactions and kinetics of monochloramine with triclosan havenot previously been reported in the literature.The objective of this study was to evaluate the kinetics and the reaction pathway of thetriclosan/free chlorine and triclosan/monochloramine reactions. A mechanism washypothesized to explain the pH dependency of the triclosan/free chlorine reactions.Products of the reactions were identified and monitored with reaction time. Includes 8 references, figures.

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Edition: Vol. - No. Published: 11/02/2003 Number of Pages: 12File Size: 1 file , 300 KB