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EFFECT OF UV IRRADIATION ON ORGANIC MATTER EXTRACTED FROM TREATED OHIO RIVER WATER STUDIED THROUGH THE USE OF ELECTROSPRAY MASS SPECTROMETRY
Citation:
Magnuson*, M L., C A. Kelty*, C. M. Sharpless, K. G. Linden, W. R. Fromme, D. H. Metz, AND R. Kashinkunti. EFFECT OF UV IRRADIATION ON ORGANIC MATTER EXTRACTED FROM TREATED OHIO RIVER WATER STUDIED THROUGH THE USE OF ELECTROSPRAY MASS SPECTROMETRY. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 36(23):5252-5260, (2002).
Description:
Ohio River water was treated by settling, sand filtration, and granular activated carbon filtration. It was then irradiated by low pressure (monochromatic) and medium pressure (polychromatic) UV lamps to investigate the effects of UV irradiation of natural organic matter (NOM). When the NOM, collected by solid phase extraction cartridges, was analyzed by conventional UV spectroscopy and size exclusion chromatography (SEC), no significant changes in the NOM were revealed for various UV doses. Positive and negative electrospray ionization mass spectrometry (ESI-MS) of the NOM produced mass spectra that vary significantly with UV dose. The UV dosage conditions also appear to affect the reactivity of the NOM to subsequent chlorination. The magnitude of the spectral changes is generally greater for medium pressure lamps than for low pressure and increases with UV exposure. Based on the observed MS peaks, the changes may be due to the presence of lignin, resulting perhaps from photooxidation and/or photorearrangement of macromolecules in the sample. When chlorination is used for secondary disinfection, these results suggest that it may be important to consider the effects of UV irradiation on the NOM before applying UV disinfection technology to a particular source water.