Reactive nitrogen species (RNS) formed from nitrate photolysis has demonstrated capability of degrading refractory chemicals. This study investigated the influence of UV wavelengths (255, 285 and 365 nm) on photolysis of nitrate for degradation of contaminants with weakly electron-donating moieties, atrazine (ATZ). UV photolysis, RNS, and hydroxyl radical were identified as main contributors to ATZ degradation in UV/nitrate system, and their contributions were investigated. The impacts of natural organic matter and carbonate/bicarbonate in UV285/nitrate and UV255/nitrate were compared by variance decomposition analysis. Main transformation products of ATZ in UV285/nitrate system were identified and possible pathways were proposed. In this presentation, deep insights on the influence of UV wavelength on nitrate photolysis and ATZ degradation will be provided.

Impact of wavelengths on atrazine photo-degradation in the presence of nitrate

ACS Fall 2021

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