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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:评价有机质和CaCl2作为土壤改良剂后CaCl2和rhizon提取方法的提取效率,以提高Cd和Zn的迁移率

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摘要

A pot experiment was conducted to study the extractability of cadmium and zinc by CaCl 2 and rhizon extraction methods after the application of organic matter and chloride as soil amendments. Two methods, Rhizon and CaCl 2 extraction methods were concurrently employed to study the effects of the various amendments on the mobility of Cd and Zn. Both CaCl 2 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 CaCl 2 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 CaCl 2 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 referentially absorbed in cation exchange positions. Therefore the Ca 2+ 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,CaCl 2和根茎萃取方法对镉和锌的萃取能力。同时采用了Rhizon和CaCl 2萃取两种方法来研究各种修饰物对Cd和Zn迁移率的影响。施用这些修正剂后,CaCl 2和Rhizon萃取方法通常都萃取出相当数量的重金属。但是,实验结果表明,与CaCl 2提取方法相比,Rhizon采样器提取了更高浓度的Cd和Zn。根茎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,CaCl 2的施加对Cd和Zn的迁移率具有显着的动员作用,这是由于Cd和Zn被氯离子络合的综合作用的结果,并且Cd和Zn被参考地吸收在阳离子中交换职位。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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