Effects of chemical oxidation on sorption and desorption of PAHs in typical Chinese soils.
In situ chemical oxidation is a commonly applied soil and groundwater remediation technology, but can have significant effects on soil properties, which in turn might affect fate and transport of organic contaminants. In this study, it was found that oxidation treatment resulted mainly in breakdown of soil organic matter (SOM) components. Sorption of naphthalene and phenanthrene to the original soils and the KMnO(4)-treated soils was linear, indicating that hydrophobic partitioning to SOM was the predominant mechanism for sorption. Desorption from the original and treated soils was highly resistant, and was well modeled with a biphasic desorption model. Desorption of residual naphthalene after treating naphthalene-contaminated soils with different doses of KMnO(4) also followed the biphasic desorption model very well. It appears that neither changes of soil properties caused by chemical oxidation nor direct chemical oxidation of contaminated soils had a noticeable effect on the nature of PAH-SOM interactions.
Chen
Wei
W
College of Environmental Science and Engineering, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Wei Jin Road 94, Tianjin 300071, China. chenwei@nankai.edu.cn
Hou
Lei
L
Luo
Xiaoli
X
Zhu
Lingyan
L
D000327:Adsorption; D002681:China; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006812:Humic Substances; D008956:Models, Chemical; D009281:Naphthalenes / Q000737:chemistry; D010084:Oxidation-Reduction; D010616:Phenanthrenes / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D011196:Potassium Permanganate; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000737:chemistry*; D013997:Time Factors
D006812:Humic Substances; D009281:Naphthalenes; D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D012989:Soil Pollutants; D011196:Potassium Permanganate; C031721:naphthalene; C031181:phenanthrene