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Microelectrode evaluation of in situ oxidant reactivity and pH variability at new ductile iron and copper coupon surfaces
Citation:
Lee, W., D. Wahman, D. Lytle, J. Pressman, AND J. Chung. Microelectrode evaluation of in situ oxidant reactivity and pH variability at new ductile iron and copper coupon surfaces. WATER RESEARCH. Elsevier Science Ltd, New York, NY, 243:120352, (2023). https://doi.org/10.1016/j.watres.2023.120352
Impact/Purpose:
The environmental or health problem addressed by the study: Corrosion of metals in drinking water distribution system pipe materials. A general description of the work and results: Experiments have been conducted to evaluate the ability of microelectrodes to assess the reaction kinetics of free chlorine, monochloramine, and dissolved oxygen at the surfaces of new ductile iron and copper coupons. The long-term importance or significance of the findings: Provides a new methodology to assess reactivity of pipe surfaces. Who would be interested in or could apply the results (e.g. program or regional partners, general public, local communities): Researchers trying to understand oxidant reactivity of pipe surfaces.
Description:
This study represents an important first step towards using microelectrodes to (1) understand and provide direct measurement of oxidant microprofiles from the bulk water to the metal surface; (2) determine pipe wall reactivity using the directly measured concentrations profiles versus estimated pipe wall reactivity from bulk water measurements, and (3) understand how variables measured by bulk water samples (e.g., pH) may be drastically different from what is occurring at and across the metal surface. Together, these insights will assist in understanding disinfectant residual maintenance, corrosion, and metals release.
URLs/Downloads:
DOI: Microelectrode evaluation of in situ oxidant reactivity and pH variability at new ductile iron and copper coupon surfaces