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<p>This study investigates the complex dynamics of subsurface contamination, focusing on creosote as a dense non-aqueous phase liquid (DNAPL) in alluvial and urban soils. The objective of the research is to integrate different geophysical and chemical techniques to characterize the physical and chemical properties of the subsurface environment and the extent of contamination. By applying seismic method, electrical conductivity (EC) profiles and Laser Induced Fluorescence (LIF), we identified key stratigraphic features—such as sandy pathways and clay retention layers—that influence contaminant distribution, along with zones of creosote accumulation. The results demonstrated the complementarity of these methods, with the seismic tests providing information on the lithology and the EC profiles providing high-resolution data on soil properties. LIF enabled accurate mapping of polycyclic aromatic hydrocarbons (PAHs), confirmed by laboratory analyses using gas chromatography coupled with mass spectrometry. The results emphasize the need for an integrated approach to characterizing contaminated sites, especially in heterogeneous environments. In addition, the study shows the importance of adapting the method to local conditions in order to accurately spatialize contaminant distributions. These results offer significant implications for improving remediation strategies in DNAPL-affected areas, providing a more accurate and less invasive means of subsurface analysis.</p>

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Non-invasive Techniques or Determining Distribution and Storage Zones of Creosote Contamination in Heterogeneous Soils

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Alexandre Muselli Barbosa,
  • Leonides Guireli Netto,
  • Otávio Coaracy Brasil Gandolfo

摘要

This study investigates the complex dynamics of subsurface contamination, focusing on creosote as a dense non-aqueous phase liquid (DNAPL) in alluvial and urban soils. The objective of the research is to integrate different geophysical and chemical techniques to characterize the physical and chemical properties of the subsurface environment and the extent of contamination. By applying seismic method, electrical conductivity (EC) profiles and Laser Induced Fluorescence (LIF), we identified key stratigraphic features—such as sandy pathways and clay retention layers—that influence contaminant distribution, along with zones of creosote accumulation. The results demonstrated the complementarity of these methods, with the seismic tests providing information on the lithology and the EC profiles providing high-resolution data on soil properties. LIF enabled accurate mapping of polycyclic aromatic hydrocarbons (PAHs), confirmed by laboratory analyses using gas chromatography coupled with mass spectrometry. The results emphasize the need for an integrated approach to characterizing contaminated sites, especially in heterogeneous environments. In addition, the study shows the importance of adapting the method to local conditions in order to accurately spatialize contaminant distributions. These results offer significant implications for improving remediation strategies in DNAPL-affected areas, providing a more accurate and less invasive means of subsurface analysis.