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| Effects of pig manure-derived dissolved organic matter on the adsorption of cadmium to soils in the Three Gorges Reservoir region, China |
| Received:November 27, 2019 |
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| KeyWord:adsorption;cadmium;dissolved organic matter;water level fluctuation zone |
| Author Name | Affiliation | E-mail | | FANG Yu-xiao | Faculty of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
Key Laboratory of Mountain Surface Biological Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, China Acadmey of Sciences, Chengdu 610000, China | | | ZHANG Wei | College of Tourism and Land Resources, Chongqing Technology and Business University, Chongqing 400067, China | | | CUI Jun-fang | Key Laboratory of Mountain Surface Biological Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, China Acadmey of Sciences, Chengdu 610000, China | | | ZHANG Jian-qiang | Faculty of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China | | | TANG Xiang-yu | Key Laboratory of Mountain Surface Biological Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, China Acadmey of Sciences, Chengdu 610000, China | xytang@imde.ac.cn | | ZHOU Qi-gang | College of Tourism and Land Resources, Chongqing Technology and Business University, Chongqing 400067, China
Chongqing Key Laboratory of Spatial Data Mining and Big Data Integration for Ecology and Environment, Chongqing 400067, China | |
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| Abstract: |
| The periodical flooding-drainage effect results in spatial variations in the soil physicochemical properties in the water level fluctuation zone(WLFZ)in the Three Gorges Reservoir region. This affects the sorption and transport behavior of heavy metals. Soils beyond (177 m)and within(160 m and 151 m)the WLFZ were investigated via batch sorption experiments. The results showed that the kinetic sorption of Cd fit the Elovich equation(R2>0.886)well, whereas sorption isotherms fit Langmuir and Freundlich equations well. Chemical sorption was the dominant sorption mechanism for Cd and strong non-linearity was observed(1/n ≤ 0.45). The sorption intensities(implied by Qe, Qm, and Kf)of Cd to the soils followed the altitude order of 160 m > 177 m > 151 m. Soil pH was the critical factor that determined the sorption intensity of Cd to the soils. The addition of pig manure-derived dissolved organic matter(DOM)decreased the sorption of Cd effectively, especially to the soils at the lower end(151 m)of the WLFZ. The sorption of Cd to soil rapidly decreased in the presence of DOM when the concentration of DOM added was lower than 30 mg C·L-1, whereas a slow increase of sorption occurred when the concentration was higher. Consequently, attentions should be given to the soils at the lower end of the WLFZ regarding the potential effects of exogenous DOM on the fate of Cd in the "Post Three Gorges" region. |
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