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Experiments on chromium migration from soil to surface runoff water |
Tong Juxiu1,2, Liu Yang1,2, Sun Huaiwei3 |
1.Key Laboratory of Groundwater Cycle and Environment Evolution(China University of Geosciences, Beijing), Ministry of Education, Beijing 100083, China; 2. School of Water Resources & Environment, China University of Geosciences, Beijing, Beijing 100083, China; 3. School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China |
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Abstract To explore the surface runoff water pollution caused from heavy metals in agricultural soil, the Cr(VI)migration features from soil to surface runoff water were investigated by using indoor simulated rainfalls and the soils with adsorptive Cr(VI)solute. It was identified that the dissolvable Cr(VI)mass concentration in surface runoff water decreased with time in a power function according to the observed dissolvable Cr(VI)mass concentrations in the surface runoff water and the mass rate of dissolvable Cr(VI)melted into the surface runoff and subsurface drainage water under different conditions. Also, the poorer the subsurface drainage, the larger the initial soil volumetric water content, and the more shallow the maximum depth of collected water on the soil surface, the greater the Cr(VI)mass concentration and mass rate of dissolvable Cr(VI)melted into the surface runoff water from the soil. When the surface runoff and subsurface drainage water co-existed, the mass rate of dissolvable Cr(VI)melted into the subsurface drainage water was much higher than into the runoff water. This su-ggested that the most dissolvable Cr(VI)has gone into the subsurface drainage water.
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Received: 17 April 2013
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