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Comparison of two sequential extraction procedures for tungsten fractionation in the tungsten mining soils

机译：钨矿土壤中钨分馏两种顺序提取程序的比较

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摘要

Two sequential extraction procedures including Tessier and Wenzel schemes have been evaluated for the study of tungsten fractionation in soil samples adjacent to the World's largest and longest-operating tungsten mines in China. The efficiency and suitability of two methods and the corresponding extraction steps for partitioning tungsten were compared. Results showed the Tessier scheme classical for cation metals was inappropriate for tungsten fractionation. Although the percentage of readily bioavailable tungsten fractions extracted by the Tessier method is comparable to the Wenzel method, the Tessier scheme still has some drawbacks for partitioning tungsten mainly arising from the lack of selectivity of some of the reagents used. The Wenzel scheme has higher extraction recovery and efficiency than the Tessier method, especially for extracting amorphous and crystalline oxyhydroxides which were mainly responsible for tungsten retention. As a final conclusion, the study indicated that the Wenzel scheme should be more suitable for tungsten fractionation, but we need to make further improvement on the Wenzel scheme by supplementing the extraction stage for the oxidisable fraction to find a reliable and easy to use method to characterize tungsten forms in all soil samples to provide valuable information for risk assessment.
机译：已经评估了包括TESSIER和WENEL计划的两个连续提取程序，用于研究邻国在中国世界上最大和最长的钨矿的土壤样本中的钨分级。比较了两种方法的效率和适用性和相应的钨钨的提取步骤。结果表明，TESSIER方案为阳离子金属的古典不适合进行钨分馏。尽管由TESSIER方法提取的易生物可利用的钨级分的百分比与温革方法相当，但是TESSIER方案仍然具有用于分配钨的一些缺点，其主要来自缺乏使用的一些试剂的选择性。温革的提取恢复和效率较高，尤其是用于提取主要负责钨潴留的无定形和结晶羟基氧化物。作为最终的结论，该研究表明，温敦方案应该更适合钨分馏，但我们需要通过补充氧化级分的提取阶段来进一步改善温革方案，以找到可靠且易于使用的方法在所有土壤样本中表征钨形式，为风险评估提供有价值的信息。

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    《RSC Advances》 |2019年第61期|共7页
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  • 正文语种 eng
  • 中图分类 化学;
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