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Lead Speciation and Association with Organic Matter in Various Particle-Size Fractions of Contaminated Soils

机译：污染土壤中各种粒径级分中的铅形态及其与有机物的关系

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摘要

Lead (Pb) stabilization in polluted soils treated by a Pb immobilization technique may be dependent on the speciation of Pb present in specific particle-size fractions of the soil. However, the scale-dependency of Pb speciation in contaminated soils is still not clearly understood. In this study, the natures and amounts of Pb chemical forms were determined in five Pb-polluted soil samples from Klity Village, Thailand, and their particle-size fractions. This was achieved using multiple analytical tools, including bulk extended X-ray absorption fine structure (EXAFS) spectroscopy at the Pb LIII edge. Results suggested that cerussite, Pb sorbed to goethite, and Pb-humate were present in specific amounts in all bulk samples and their particle-size fractions. The highest amounts of Pb-humate were found in the smallest particles of the soil samples. This Pb form was present in the fine particles of a soil sample, but remained undetected when analyzing the bulk sample. Since Pb-SOM association may impede the formation of pyromorphite in soils, the results implied that the extent of Pb immobilization in a polluted soil treated by P may be less than predicted if Pb speciation is only characterized at the macroscopic scale from the bulk soil sample prior remediation.
机译：用铅固定化技术处理的污染土壤中的铅（Pb）稳定性可能取决于存在于土壤特定粒度级分中的Pb的形态。但是，对污染土壤中铅形态的尺度依赖性仍不清楚。在这项研究中，确定了泰国Klity村的5个受Pb污染的土壤样品中Pb化学形态的性质和数量，以及它们的粒径分数。这是使用多种分析工具实现的，包括在Pb LIII边缘的大量扩展X射线吸收精细结构（EXAFS）光谱。结果表明，在所有大块样品及其粒度级分中都存在特定量的陶粒，铅吸附到针铁矿上的铅和腐植酸铅。在土壤样品的最小颗粒中发现了最高的腐植酸铅含量。这种Pb形式存在于土壤样品的细颗粒中，但在分析大量样品时仍未被发现。由于Pb-SOM缔合可能会阻碍土壤中焦晶石的形成，因此，结果表明，如果仅从宏观土壤样本中表征Pb形态，那么P处理的污染土壤中Pb固定化的程度可能会小于预测值。事先补救。

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  • 来源
    《Environmental Science & Technology》 |2018年第12期|6780-6788|共9页
  • 作者

    Gautier Landrot; Saengdao Khaokaew;

  • 作者单位

    Synchrotron SOLEIL, L’Ormes des Merisiers, 91190, Saint Aubin, France;

    Department of Soil Science, Kasetsart University, 50 Ngam Wong Wan Rd, Lat Yao Chatuchak, Bangkok 10900, Thailand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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