Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12608
Title: Acceleration and quenching of the photolysis of PCB in the presence of surfactant and humic materials
Authors: Chu, W 
Chan, KH
Kwan, CY
Jafvert, CT
Issue Date: 2005
Publisher: American Chemical Society
Source: Environmental science & technology, 2005, v. 39, no. 23, p. 9211-9216 How to cite?
Journal: Environmental science & technology 
Abstract: The photodecay of a polychlorobiphenyl (PCB) congener, 2,3,4,5- tetrachlorobiphenyl (TeCB), in a surfactant-aided soil-washing process was investigated. The surfactant was found to be a useful hydrogen source in improving the TeCB photodecay via photoreduction process, while the light attenuation effect resulted from the nontarget compounds in the solution, and the impact of humic materials that co-extracted from the soil played important roles in the process of photolvtic destruction of TeCB. A well-defined sediment, EPA-11, was used as the source of humic materials in examining the acceleration and quenching effects in the photolysis process. Experimental results indicated that the low dose of humic materials mainly acted as a supplementary hydrogen source to improve the photodegradation rate, while at a higher dose its amphoteric property of being a photochemical quencher become perceptible gradually, thus retarding the reaction. These effects were inspected and the dominant rate constants were quantified through the examination of possible sub-reactions in the assistant of proposed linear models in this study. The models under three different conditions at zero, low, and high humic levels associated with a light attenuation model were successfully developed to solve the dominant rate constants of the process. The good correlations between the experimental data and the models verify that the proposed reaction mechanisms of rate acceleration (resulting from the hydrogen source characteristics of the surfactant and humic material) and rate retardation (high levels of humic materials) coexist in the process.
URI: http://hdl.handle.net/10397/12608
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/es0511826
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

34
Last Week
0
Last month
1
Citations as of Sep 19, 2017

WEB OF SCIENCETM
Citations

31
Last Week
0
Last month
1
Citations as of Sep 5, 2017

Page view(s)

44
Last Week
1
Last month
Checked on Sep 17, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.