Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18626
Title: The aqueous degradation of butylated hydroxyanisole by UV/S 2O8 2- : study of reaction mechanisms via dimerization and mineralization
Authors: Lau, TK
Chu, W 
Graham, NJD
Issue Date: 2007
Publisher: American Chemical Society
Source: Environmental science & technology, 2007, v. 41, no. 2, p. 613-619 How to cite?
Journal: Environmental science & technology 
Abstract: Three distinctive phases of BHA reactivity toward UV/S2O 8 2- at acidic, neutral, and basic pH range were examined, where 80-100% mineralization has been observed within an hour of irradiation under 254 nm. A reduction in solution pH during the reaction was observed mainly due to the complete conversion of S2O8 2- to sulfate ion together with proton generation. Seven measurable intermediates were found via an oxidation and dimerization process at all tested pH levels. The BHA decay mechanisms are quite different in acidic condition and at other pH levels. There are three unique intermediates that are only detectable at pH 3 via two additional pathways. This is due to the generation of weaker oxidants or radicals which results in a slower degradation of the BHA, and therefore, the accumulation of these intermediates to detectable levels. The rate of BHA decay generally increases from low to high pH levels; however, the corresponding mineralization at higher pH is retarded due to the futile process of recombining radicals and involvement of intermediates. Therefore, neutral pH was suggested to be the optimum condition in terms of mineralization and moderate efficiency in removing BHA.
URI: http://hdl.handle.net/10397/18626
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/es061395a
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