Citation:

Hyoung Lee, W., J. G. PRESSMAN, D. WAHMAN, AND P. L. Bishop. Monochloramine Microelectrode for In-Situ Application Within Chloraminated Distribution System Biofilm. In Proceedings, 2008 AWWA Water Quality Technology Conference, Cincinnati, OH, November 16 - 20, 2008. American Water Works Association, Denver, CO, ., (2008).

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A monochloramine microelectrode with a tip size between 5 and 15 μm and using platinum wire was successfully designed, fabricated and characterized for in-situ monochloramine measurement within chloraminated distribution system biofilm. The monochloramine microelectrode showed sensitivity toward monochloramine concentrations (0.54 to 16.1 mg Cl2/L) at an applied potential of +550 mV (Ag/AgCl reference electrode) at pH 8.0 and 23°C. The monochloramine microelectrode has successfully measured monochloramine microprofiles with high spatial resolution (50 μm) without biofilm structure disruption during measurements. Ultimately, this research will lead to a better understanding of the monochloramine microelectrode for in situ application within a chloraminated drinking water system biofilm, and along with other microelectrodes (e.g., ammonia, pH, DO) under development, elucidate nitrification phenomena occurring in the biofilm.

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