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Updated: Jan 24, 2026

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LNAPL saturation derived from laser induced fluorescence method.

Elias Hideo Teramoto1, Elias Isler2, Luciana Polese1

  • 1Laboratório de Estudos de Bacias and Centro de Estudos Ambientais, UNESP - Universidade Estadual Paulista, Av. 24A, 1515 Rio Claro, Sao Paulo, Brazil; Departamento de Geologia Aplicada and Centro de Estudos Ambientais, UNESP - Universidade Estadual Paulista, Av. 24A, 1515 Rio Claro, Sao Paulo, Brazil.

The Science of the Total Environment
|June 1, 2019
PubMed
Summary

High-resolution laser-induced fluorescence (LIF) can now estimate light non-aqueous-phase liquid (LNAPL) saturation in porous media. This breakthrough aids in more accurate LNAPL volume assessment for effective subsurface remediation.

Keywords:
Fuel spill experimentsHydrocarbon contaminated-sitesLNAPL saturationLaser-induced fluorescence

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Area of Science:

  • Environmental Science
  • Hydrogeology
  • Geochemistry

Background:

  • Light non-aqueous-phase liquid (LNAPL) spills contaminate shallow aquifers, posing human health risks.
  • Traditional methods fail to quantify residual hydrocarbon volumes, limiting remediation effectiveness.
  • High-resolution laser-induced fluorescence (LIF) visualizes LNAPL extent but not saturation.

Purpose of the Study:

  • To establish an empirical relationship between LIF signals and LNAPL saturation in porous media.
  • To assess the potential of LIF for quantifying LNAPL saturation in situ.
  • To improve LNAPL volume estimation for remediation planning.

Main Methods:

  • Conducted medium-scale spill experiments.
  • Measured LNAPL saturation and corresponding LIF fluorescence signals.
  • Analyzed the empirical relationship between LIF intensity and LNAPL saturation.

Main Results:

  • A strong exponential function correlates LIF signals with LNAPL saturation.
  • LIF successfully predicts LNAPL saturation in porous media.
  • Empirical coefficients are site-dependent due to LNAPL variability and weathering.

Conclusions:

  • LIF technique shows significant potential for quantifying LNAPL saturation.
  • Accurate saturation measurement enables more precise LNAPL volume estimation.
  • This advancement supports improved remediation strategies for contaminated aquifers.