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首页> 外文期刊>Environment international >Effects of readily dispersible colloid on adsorption and transport of Zn, Cu, and Pb in soils
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Effects of readily dispersible colloid on adsorption and transport of Zn, Cu, and Pb in soils

机译：易分散胶体对土壤中锌，铜和铅的吸附和迁移的影响

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Soil colloids (< 0.002 mm) were extracted from three types of soils to make the colloid-bound forms of Zn, Cu, and Pb solution. The clay mineral types and composition of the colloids, the adsorption characteristics of the colloids, and the effect of readily dispersible colloid on the transport of metals and the quality of the soils and groundwater were studied. The results showed that the adsorption capacity of Cu, Zn, and Pb was greater for the Aquic Vertisols (Shajiang Black soil) as compared to the Udic Luvisols (Brown soil) and Usdic Luvisols (Cinnamon soil), due to the difference of clay content and clay mineral composition in the different soils. The adsorption capacity of Pb was much higher than that of Zn and Cu for the same soils, which would contribute to the chemical properties of metals and specific adsorption characters of the colloids. The mobility of Zn in soils was greater than that of Cu and Pb, while similar trend was found in the transportation processes for Zn and Cu. The concentration of Zn and Cu in leachates increased as the leaching solution volume increased, but the migration of Pb was negligible, and the concentration of Pb could not been detected in leachates even after 7.5 pore volume leaching solution. The influence of mobility on Zn and Cu transport was different for different type of colloids. The mobility caused by readily dispersible colloids from Aquic Vertisols was greater as compared to that of Udic Luvisols and Usdic Luvisols. Analysis of soils after column leaching indicated that Zn was distributed much deeper than Cu, but Pb was almost not migrated, and mainly accumulated in the soil surface. Therefore, Zn had greater tendency for the groundwater pollution than Cu and Pb, and Pb tends to contaminate the surface soils.
机译：从三种类型的土壤中提取土壤胶体（<0.002 mm），以形成锌，铜和铅溶液的胶体结合形式。研究了粘土矿物的种类和胶体组成，胶体的吸附特性以及易分散的胶体对金属迁移，土壤和地下水水质的影响。结果表明，由于黏土含量的差异，Aquic Vertisols（沙江黑土）比Udic Luvisols（棕壤）和Usdic Luvisols（肉桂土）对Cu，Zn和Pb的吸附能力更高。和粘土在不同土壤中的矿物组成。在相同的土壤上，Pb的吸附容量远高于Zn和Cu，这将有助于金属的化学性质和胶体的特定吸附特性。锌在土壤中的迁移率大于铜和铅的迁移率，而在锌和铜的迁移过程中也发现了相似的趋势。浸出液中Zn，Cu的含量随浸出液体积的增加而增加，但Pb的迁移率可忽略不计，即使在7.5孔体积浸出液中也无法检出Pb的浓度。对于不同类型的胶体，迁移率对Zn和Cu迁移的影响是不同的。与Udic Luvisols和Usdic Luvisols相比，由Aquic Vertisols容易分散的胶体引起的迁移率更大。柱浸后土壤的分析表明，Zn的分布远比Cu的深，但Pb几乎不迁移，并且主要在土壤表面积累。因此，Zn的地下水污染趋势比Cu和Pb大，Pb容易污染表层土壤。

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