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609370 
Journal Article 
UV Photodegradation of Inorganic Chloramines 
Jing, LI; Blatchley, IER 
2009 
1 
Environmental Science & Technology
ISSN: 0013-936X
EISSN: 1520-5851 
43 
1 
60-65 
The ultraviolet (UV) photolysis of monochloramine (NH2Cl), dichloramine (NHCl2), and trichloramine (NC13) in aqueous solution was investigated at wavelengths of 222, 254, and 282 nm. All three chloramines can be degraded by UV irradiation, and the quantum yields for these processes are wavelength-dependent Stable photoproducts include nitrite, nitrate, nitrous oxide, and ammonium. Solution pH was observed to have little effect on the rate of photodecay; however, the product distribution showed strong pH dependence. Nitrate formation was favored at low pH, while nitrite formation was favored at high pH. The effects of pH on formation of N2O and NH4+ were less clear. On the basis of the results, a mechanism of photodecay of monochloramine is proposed. [ABSTRACT FROM AUTHOR] Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 
CHLORAMINES; RESEARCH; PHOTODEGRADATION; ULTRAVIOLET spectra; WAVELENGTHS; RESEARCH -- Methodology; IRRADIATION; HYDROGEN-ion concentration -- Measurement