Inhibition vs. enhancement of the nitrate-induced photo-transformation of organic substrates by the °OH scavengers bicarbonate and carbonate
Articolo
Data di Pubblicazione:
2009
Abstract:
Contrary to common expectations, the hydroxyl scavengers, carbonate and bicarbonate, are able to enhance the phototransformation by nitrate of a number of substituted phenols. Carbonate and bicarbonate, in addition to modifying the solution pH, are also able to induce a considerable formation of the carbonate radicals upon nitrate photolysis. The higher availability of less-reactive species than the hydroxyl radical would contribute to substantially enhance the photodegradation of the phenols/phenolates that are sufficiently reactive toward the carbonate radical. This phenomenon has a potentially important
impact on the fate of the relevant compounds in surface waters. In contrast, the degradation of compounds that are not sufficiently reactive toward CO3-° radical is inhibited by
carbonate and bicarbonate because of the scavenging of OH radicals.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
D. Vione; S. Khanra; S. Cucu Man; P.R. Maddigapu; R. Das; C. Arsene; R.I.Olariu; V. Maurino; C. Minero
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