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首页> 外文期刊>Separation and Purification Technology >Feasibility study of the use of different extractant agents in the remediation of a mercury contaminated soil from Almaden
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Feasibility study of the use of different extractant agents in the remediation of a mercury contaminated soil from Almaden

机译：在阿尔玛登（Almaden）的汞污染土壤修复中使用不同萃取剂的可行性研究

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摘要

The soil of Almaden mining district in Spain has a high concentration of mercury (1000 mg kg~(-1)), therefore decontamination activities are necessary. This paper studies the effectiveness of some chelant agents (thiosulfate, EDTA, iodide and HNO3) for the remediation of this soil which has been polluted for several millennia. The risk assessment of the contamination and the feasibility study (RA-FS) of the remediation were based on a standard sequential extraction procedure (SEP) together with lixiviation tests. Results obtained from these RA-FSs allow the prediction of the mercury removal reached in bench scale tests of the flushing technique. In addition the SEP was performed before and after treatments, and it was found that in some cases the remaining mercury concentration after treatment is associated to the more mobile fractions, indicating that additional treatments would be required. It also indicates that an important additional removal would be obtained if acid extraction is carried out after the first treatment. Finally, the reliability of the standard SEP used was tested to determine if the very high total metal concentration of this contaminated site affects the fractionation results. This was done by the repetition of each sequential extraction step before moving to the next one. Results indicate that both procedures give almost identical results for mercury but some important differences can be observed for iron.
机译：西班牙Almaden矿区的土壤中汞含量很高（1000 mg kg〜（-1）），因此必须进行净化处理。本文研究了一些螯合剂（硫代硫酸盐，EDTA，碘化物和HNO3）对被污染了几千年的土壤的修复效果。污染的风险评估和修复的可行性研究（RA-FS）基于标准的顺序萃取程序（SEP）和浸滤试验。从这些RA-FS获得的结果可以预测冲洗技术的台式测试中所达到的除汞效果。此外，在处理之前和之后进行了SEP，发现在某些情况下，处理后剩余的汞浓度与流动性更高的馏分有关，这表明需要进行其他处理。这也表明，如果在第一次处理后进行酸提取，将获得重要的附加去除效果。最后，测试了所用标准SEP的可靠性，以确定该受污染部位的极高的总金属浓度是否会影响分馏结果。这是通过在移至下一个步骤之前重复每个顺序提取步骤来完成的。结果表明，两种方法对汞的测定结果几乎相同，但是对于铁，可以观察到一些重要的差异。

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