| 土壤中Cr(Ⅵ)的地表径流迁移试验研究 |
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| 引用本文： | 童菊秀,刘洋,孙怀卫.土壤中Cr(Ⅵ)的地表径流迁移试验研究[J].排灌机械工程学报,2014,32(3):271-276. |
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| 作者姓名： | 童菊秀 刘洋 孙怀卫 |
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| 作者单位： | 1.中国地质大学(北京)地下水循环与环境演化教育部重点实验室, 北京 100083; 2.中国地质大学(北京)水资源与环境学院, 北京 100083; 3.华中科技大学水电与数字化工程学院, 湖北 武汉 430074 |
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| 摘 要： | 为了探讨农田土壤中重金属的地表径流污染,以含有吸附性溶质重铬酸钾Cr(Ⅵ)的土壤为试验材料,开展了室内模拟降雨试验,以研究土壤中Cr(Ⅵ)的地表径流迁移规律.通过对比分析不同试验条件下地表径流中溶解性溶质Cr(Ⅵ)的质量浓度变化过程,及其在地表径流和地下排水溶液中流失的质量速率过程后发现,溶解性溶质Cr(Ⅵ)流失到地表径流溶液中的质量浓度随时间以乘幂函数形式减小.当试验中地下排水条件越差、土壤初始体积含水率越大、地表最大积水深度越浅时,土壤溶质流失到地表径流中的溶解性Cr(Ⅵ)质量浓度越高,相应的土壤溶质流失到地表径流中的质量速率越大.当试验中同时有地下排水和地表径流产生时,土壤中溶解性Cr(Ⅵ)流失到地下排水中的质量速率远远大于地表径流,表明土壤中溶解性Cr(Ⅵ)大部分流失在地下排水中.
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| 关 键 词： | 六价铬 地表径流 吸附性溶质 室内试验 地下排水 |
| 收稿时间： | 2013-04-17 |
Experiments on chromium migration from soil to surface runoff water |
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| Tong Juxiu,Liu Yang,Sun Huaiwei.Experiments on chromium migration from soil to surface runoff water[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(3):271-276. |
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| Authors: | Tong Juxiu Liu Yang Sun Huaiwei |
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| Institution: | 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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| Keywords: | Cr(Ⅵ) surface runoff adsorptive solute laboratory experiment subsurface drainage |
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