Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13308
Title: Amphoteric effect of humic acids in surfactant-aided photolysis of polychlorobiphenyls
Authors: Chu, W 
Kwan, CY
Keywords: Acids
PCB
Soil pollution
Surface-active agents
Issue Date: 2003
Publisher: American Society of Civil Engineers
Source: Journal of environmental engineering, 2003, v. 129, no. 8, p. 716-722 How to cite?
Journal: Journal of environmental engineering 
Abstract: Polychlorobiphenyls (PCBs) are one of the most environmentally problematic organic contaminants present in soils and sediments due to their long-life in direct disposal or spills in soil. It is known that surfactant-aided soil washing followed by a photodechlorination process has the ability to separate PCBs from the soil and decompose them all in one step. However, the influence of humic substances on the removal of PCBs in surfactant-aided ultraviolet systems is of special interest because of the involvement of humic materials in the soil-washing process. A PCB congener, 4,4′-dichlorobiphenyl (DCB) was used as a probe in this study. At low humic acid (HA) concentrations, humic substances promote the photochemical reaction, but a high dose of HA leads to retardation of the DCB decay. A mechanism for the amphoteric effect of HA on the photodecay of DCB is proposed in this study, and two mathematical models are developed to successfully rationalize the amphoteric effect of HA in the photolysis process.
URI: http://hdl.handle.net/10397/13308
ISSN: 0733-9372
DOI: 10.1061/(ASCE)0733-9372(2003)129:8(716)
Appears in Collections:Journal/Magazine Article

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

SCOPUSTM   
Citations

2
Citations as of Aug 11, 2017

WEB OF SCIENCETM
Citations

2
Last Week
0
Last month
0
Citations as of Aug 14, 2017

Page view(s)

36
Last Week
2
Last month
Checked on Aug 13, 2017

Google ScholarTM

Check

Altmetric



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