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首页> 外文期刊>Journal of Environmental & Analytical Toxicology >Assessing the Extraction Efficiency of CaCl2 and Rhizon Extraction Methods after the Application of Organic Matter and CaCl2 as Soil Amendments to Enhance the Mobility of Cd and Zn
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Assessing the Extraction Efficiency of CaCl2 and Rhizon Extraction Methods after the Application of Organic Matter and CaCl2 as Soil Amendments to Enhance the Mobility of Cd and Zn

机译：应用有机质和CaCl2作为土壤改良剂以增强Cd和Zn的迁移性后评估CaCl2的萃取效率和根状茎的萃取方法

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摘要

A pot experiment was conducted to study the extractability of cadmium and zinc by CaCl2 and rhizon extraction methods after the application of organic matter and chloride as soil amendments. Two methods, Rhizon and CaCl2 extraction methods were concurrently employed to study the effects of the various amendments on the mobility of Cd and Zn. Both CaCl2 and Rhizon extraction methods generally extracted appreciable amounts of the heavy metals after the application of the amendments. However, the results from the experiment shows that the Rhizon samplers extracted higher concentrations of both Cd and Zn as compared to the CaCl2 extraction method. The use of Rhizon soil moisture sampler is also non destructive to the soil and makes it possible to ascertain levels of heavy metals at equilibrium in the soil solution without changing the compisition of the soil solution in the process of extracting it. Assessment of the soil pH in the soil samples and the Rhizon extracts after the application of the amendments showed no significant difference with the control. Comparatively, application of CaCl2 had a significant mobilizing effect on the mobility of both Cd and Zn as a result of the combined effect of complexation of Cd and Zn by the chloride anion, and by the fact that Cd and Zn are preferentially absorbed in cation exchange positions. Therefore the Ca2+ ion can displace these metals into the soil solution.
机译：进行了盆栽试验，研究了有机物和氯化物作为土壤改良剂后，CaCl2和根茎萃取方法对镉和锌的萃取能力。同时采用了Rhizon和CaCl2萃取两种方法来研究各种修饰物对Cd和Zn迁移率的影响。施用这些修正后，CaCl2和Rhizon提取方法通常都提取了相当数量的重金属。但是，实验结果表明，与CaCl2提取方法相比，Rhizon采样器提取了更高浓度的Cd和Zn。 Rhizon土壤水分取样器的使用对土壤也无害，并且可以确定土壤溶液中平衡状态下的重金属含量，而无需在提取过程中改变土壤溶液的组成。施用这些改良剂后，对土壤样品和根茎提取物的土壤pH值进行评估与对照组无显着差异。相比之下，由于氯化物阴离子使Cd和Zn络合，并且Cad和Zn优先吸附在阳离子交换中，因此CaCl2的施用对Cd和Zn的迁移率具有显着的动员作用。职位。因此，Ca 2+离子可以将这些金属置换到土壤溶液中。

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