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| Selenite transport in soils with various physico-chemical properties |
| Received:October 06, 2015 |
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| KeyWord:soil;selenium;adsorption;desorption;transport |
| Author Name | Affiliation | E-mail | | LIU Guan-nan | Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | XUE Wei | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | | | SUN Chun-mei | Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Institute of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029 | | | LI De-xian | Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China | | | LIU Xin-hui | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China | xhliu@bnu.edu.cn |
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| Abstract: |
| The transport of heavy metals in soil determines their risks to underground water and human health. However, such transport is controlled by soil properties. Here we studied the adsorption, desorption and transport of selenite in different soils:FC1(0~10 cm surface soil from Fengcheng, Jiangxi), FC2(10~20 cm subsurface soil from Fengcheng, Jiangxi), DC(surface soil in Dexing, Jiangxi) and BD(surface soil in Baoding, Hebei), to uncover the effects of soil physico-chemical properties on selenite transport in soils. Results showed that FC1 and FC2 soils, having higher amorphous iron oxide and organic matter(OM) and lower soil pH than others, had greater selenite adsorption, with the maximum adsorption capacities of 621.50 mg·kg-1 and 592.20 mg·kg-1, respectively. The maximum selenite adsorption was 219.29 mg·kg-1 for DC and 163.51 mg·kg-1 for BD. However, BD soil had the highest selenite desorption rate and amount. In packed soil column experiment, selenite transported faster in BD soil than in other soils, suggesting that the transport of selenite in soil column was influenced by the adsorption and desorption abilities of selenite in soils. In intact soil column, selenite transported quicker than in the packed soil columns. The breakthrough curve of selenite in intact soil column fitted DTSMZ(Dual-porosity with Two-Site Sorption in the Mobile Zone) model well by HYDRUS-1D software. Our results indicate the possibility of selenium pollution in groundwater due to the presence of macropore and preferential flow in the field conditions. |
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