Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34265
Title: Effect of humic acid on the photolysis of the pesticide atrazine in a surfactant-aided soil-washing system in acidic condition
Authors: Chan, KH
Chu, W 
Keywords: Atrazine
Humic acid
Model
Quantum yield
Surfactant
Issue Date: 2005
Publisher: IWA Publishing
Source: Water research, 2005, v. 39, no. 10, p. 2154-2166 How to cite?
Journal: Water research 
Abstract: The photolytic destruction of Atrazine (ATZ) following a surfactant-aided soil-washing process was investigated in the presence of humic acid (HA). A non-ionic surfactant, Brij 35, was found to be a good solving agent, extracting ATZ without causing any retardation effect on the photolysis process. However, the HA that was co-extracted from the surfactant-aided soil-washing system was found to be capable of improving the photolysis of ATZ at low concentrations, while quenching the photodegradation of ATZ at higher concentrations. By considering the light attenuation effect due to surfactant and HA, the quantum yields of the system with respect to the proposed reaction mechanisms of the associated excited states of ATZ were investigated and modeled. The relative kinetic rates of the dominant reaction mechanisms (i.e., deactivation of triplet, direct photolysis of triplet, product formation, and quenching of triplet) were then compared.
URI: http://hdl.handle.net/10397/34265
ISSN: 0043-1354
EISSN: 1879-2448
DOI: 10.1016/j.watres.2005.03.029
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