Methods of Determining Lead Speciation in Fly Ash by X-ray Absorption Fine-Structure Spectroscopy and a Sequential Extraction Procedure
Methods of Determining Lead Speciation in Fly Ash by X-ray Absorption Fine-Structure Spectroscopy and a Sequential Extraction Procedure
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DOI：
10.2116/analsci.28.481
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发表时间：
2012-05-01
影响因子：
1.6
通讯作者：
Takeda, Nobuo
中科院分区：
文献类型：
--
作者：
Funatsuki, Atsushi;Takaoka, Masaki;Takeda, Nobuo
了解废物热处理产生的飞灰中铅的化学状态非常重要，因为该元素的毒性和溶解度取决于其化学状态。本研究确定了三种潜在的方法获得定量信息的化学状态的铅粉煤灰：X射线吸收近边结构（XANES）分析，扩展X射线吸收精细结构（EXAFS）分析，和顺序提取程序。该方法的结果受pH值和样品基质的强烈影响，不一定准确反映化学状态。仅使用EXAFS很难定量检测化学物种。然而，XANES拟合使得能够直接定量化学物质。XANES分析表明，PbSiO3，PbCl2，或Pb2O（OH）（2）是粉煤灰中的主要化学物种。我们的结论是，多个分析应进行多边比较，以提高最终分析的准确性。
Understanding the chemical state of lead in fly ash generated from a waste thermal treatment is important, since the toxicity and solubility of the element depends on its chemical state. This study identified three potential methods for obtaining quantitative information regarding the chemical state of lead in fly ash: X-ray absorption near edge structure (XANES) analysis, extended X-ray absorption fine structure (EXAFS) analysis, and the sequential extraction procedure. The result of this procedure was strongly affected by the pH and sample matrix, and did not necessarily accurately reflect the chemical state. It was difficult to quantitatively examine the chemical species using only EXAFS. However, an XANES fitting enabled direct quantification of the chemical species. An XANES analysis showed that PbSiO3, PbCl2, or Pb2O(OH)(2) was the predominant chemical species in fly ash. We concluded that multiple analyses should be compared multilaterally to improve the accuracy of the final analysis.