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首页> 外文期刊>Eurasian Soil Science >Adsorption Characteristics of Zn2+ Ions onto Different Aggregate Size Fractions of Some Calcareous Soils and their Relationship with Soil Properties
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Adsorption Characteristics of Zn2+ Ions onto Different Aggregate Size Fractions of Some Calcareous Soils and their Relationship with Soil Properties

机译：Zn2 +离子对不同钙质土壤不同骨料大小分数的吸附特性及土壤性质关系

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摘要

Soils are exposed to potentially toxic trace elements (PTEs) such as zinc (Zn) through various ways. Adsorption of Zn in soils is one of factors affecting its availability and mobility. Soil aggregates are units of soil structure very important for adsorbing and retaining of PTEs. In this study, characteristics of the adsorption of Zn were studied in the aggregates of five calcareous soils. Soil aggregates were separated using the dry sieving into four size fractions: 4 to 2 and 2 to 0.25 mm (macroaggregates) and 0.25 to 0.053 and <0.053 mm (microaggregates). Then, adsorption of Zn was studied in different aggregate size fractions using an electrolyte solution calcium chloride (10 mM) containing Zn. Also, properties, such as pH, cation exchange capacity (CEC), calcium carbonate equivalent (CCE), free iron oxides, organic carbon, and amounts of total and available of Zn were determined in different aggregate size fractions. Results showed both the Langmuir and Freundlich equations are applicable to describe the adsorption of Zn in various aggregates. Adsorption capacity (qm in Langmuir model), distribution coefficient (K-F in Freundlich model), and adsorption rate (n in Freundlich model) of the Zn in the microaggregates were higher than in the macroaggregates. At the same time, adsorption energy (K-L in Langmuir model) and, therefore, maximum buffering capacity (MBC in Langmuir model) in the microaggregates were lower than in the macroaggregates. Thus, the amount and rate of Zn adsorption in the microaggregates was higher than in the macroaggregates, but it retained with lower energy. The results of regression study indicated that CEC and CCE are the most effective soil properties on the coefficients of adsorption isotherms. The results of this study revealed that the microaggregates (<0.25 mm) have a higher potential to contaminate the environment in comparison with the macroaggregates.
机译：通过各种方式将土壤暴露于潜在有毒的含有毒性的微量元素（PTE），例如锌（Zn）。土壤中Zn的吸附是影响其可用性和移动性的因素之一。土壤聚集体是土壤结构单位对于吸附和保留PTE非常重要。在这项研究中，在五种钙质土壤的聚集体中研究了Zn吸附的特征。使用干筛分分离成四个尺寸分数：4至2和2至0.25mm（大甲淀粉）和0.25至0.053和<0.053mm（微烧结）分离土壤聚集体。然后，使用含有Zn的电解质溶液氯化钙（10mM）在不同的聚集体尺寸级分中研究Zn的吸附。此外，在不同的聚集尺寸级分中测定，例如pH，阳离子交换能力（CEC），碳酸钙，有机碳，自由氧化铁，有机碳和总量和可获得的Zn的量。结果表明，Langmuir和Freundlich方程均适用于描述各种骨料中Zn的吸附。微烧结中Zn的吸附容量（朗米尔模型中的QM型QM），分布系数（K-F中的K-F）和Zn中的Zn的吸附速率（Freundlich模型中的N）高于大甲淀粉中。同时，微烧结中的吸附能量（K-L在Langmuir模型中的k-L）和在微烧结中的最大缓冲能力（MBC在朗米尔模型中）低于大甲淀粉。因此，微烧结中的Zn吸附量和速率高于大甲淀粉，但其保持较低的能量。回归研究结果表明，CEC和CCE是吸附等温线系数上最有效的土壤性质。该研究的结果表明，与大草凝结相比，微烧结（<0.25mm）具有较高的污染环境的潜力。

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