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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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  11. Comparison Of Raman And Fluorescence Microscopy For Identification Of Small (< 2 Μm) Microplastics In Soil

Comparison of Raman and fluorescence microscopy for identification of small (< 2 μm) microplastics in soil

Nick Krekelbergh1, Jie Li2, Patria Novita Kusumawardani1

  • 1Department of Environment, Research Group Soil Fertility & Nutrient Management, Ghent University Campus Coupure, Block B -1st Floor, Coupure Links 653, B-9000, Ghent, Belgium.

Environmental Pollution (Barking, Essex : 1987)
|April 10, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Fluorescence microscopy effectively detects small microplastics (MPs) in diverse soils, outperforming Raman microscopy. This direct detection method bypasses complex extraction, aiding study of tiny MPs in soil environments.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Soil Science

Background:

  • Microplastic (MP) detection in soils is challenging due to matrix interference and lack of standardized methods.
  • The behavior and dynamics of small MPs (1-2 µm) in soil remain poorly understood.
  • Current techniques often require time-consuming extraction, limiting direct observation.

Purpose of the Study:

  • To compare direct detection of small fluorescent MPs using Raman and fluorescence microscopy.
  • To evaluate detection across soil matrices with varying complexity and organic matter content.
  • To assess the suitability of these methods for studying MP transport in field conditions.

Main Methods:

  • Fluorescent polystyrene microparticles (1.71 µm) were introduced into quartz sand and three soil types (sandy loam, silt loam, clay loam).

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  • Soils were analyzed with and without organic matter removal.
  • Detection was performed using µ-Raman and fluorescence microscopy at varying MP concentrations.

    • Main Results:

    • Raman microscopy detected MPs in sand and less complex soils but failed in clay loam and soils with native organic matter.
    • Fluorescence microscopy consistently visualized MPs across all soil types and concentrations.
    • Fluorescent MPs were directly observed in field samples using fluorescence microscopy, unlike Raman microscopy.

    Conclusions:

    • Fluorescence microscopy offers a direct, efficient method for visualizing small MPs in complex soil matrices.
    • This technique eliminates the need for laborious extraction, facilitating research on MP movement and behavior.
    • Direct detection advances the understanding of minute MP dynamics in soil ecosystems.