Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25691
Title: Atrazine removal by catalytic oxidation processes with or without UV irradiation : Part II : An analysis of the reaction mechanisms using LC/ESI-tandem mass spectrometry
Authors: Chan, KH
Chu, W 
Keywords: Atrazine
Oxidation
Pathway
Toxicity
UV
Issue Date: 2005
Publisher: Elsevier
Source: Applied catalysis B : environmental, 2005, v. 58, no. 3-4, p. 165-174 How to cite?
Journal: Applied catalysis B : environmental 
Abstract: The transformation mechanisms of atrazine (ATZ) degradation by sole-UV, dark-catalytic oxidation process (dark-COP), and UV-assisted catalytic oxidation process (UVCOP) were examined and compared. Depending on the selection of the processes, one to fourteen ATZ derivatives were detected by liquid chromatography electrospray tandem mass spectrometry (LC/ESI-MS/MS). For sole-UV, a single dechlorinated product (OIET) was identified due to the homolytic or heterolytic cleavage of ATZ. On the other hand, in dark-COP, seven chlorinated (CDET, CMIT, CDIT, CEAT, CIAT, CDAT, and CAAT) and three dechlorinated (OIET, ODIT, and OAAT) intermediates were identified. However, the dechlorinated derivatives, in dark-COP, appeared in low concentrations. In UVCOP, four more dechlorinated derivatives (ODET, OEAT, OIAT, and ODAT) were found. It was suggested that alkylic-oxidation, dealkylation, and dechlorination-hydroxylation (minor in dark-COP) are the leading pathways in dark-COP and UVCOP. The final products of sole-UV, dark-COP, and UVCOP were found to be OIET, CAAT, and OAAT, respectively. In addition, the ratio of dechlorinated versus chlorinated derivatives as well as OAAT to CAAT were used to quantify the detoxification effect of dark-COP and UVCOP, where the UVCOP was suggested as a more environmentally friendly process.
URI: http://hdl.handle.net/10397/25691
ISSN: 0926-3373
EISSN: 1873-3883
DOI: 10.1016/j.apcatb.2004.12.005
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