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Gaining traction of optical modalities in the detection of microplastics
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Optical innovations in microplastic analysis: a critical review of detection strategies
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Researchers reviewed the current landscape of optical detection methods for microplastics—spanning Raman and FTIR spectroscopy, SERS, FLIM, hyperspectral imaging, and AI-enhanced analysis—highlighting that while handheld and smartphone-based platforms show strong promise for field deployment, the absence of standardized protocols and interference from organic matter remain key barriers to reliable environmental monitoring.
Exploring Innovations in Microplastics Detection: A Comprehensive Methodological Review
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This review compares cutting-edge microplastic detection methods including hyperspectral imaging, nano-thermal analysis, and atomic force microscopy, evaluating their accuracy, efficiency, and applicability across different environments. Better detection tools are foundational to understanding the true scale of microplastic pollution and enabling the evidence-based regulations needed to protect public health.
Fluorescence sensing of microplastics on surfaces
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Fluorescence techniques using Nile Red and pyrene as polarity probes can detect polystyrene microplastics directly on surfaces such as sand and sea salt, with a detection limit of approximately 0.2 micrograms per gram on sea salt. While relatively low in selectivity, this rapid method offers a practical tool for environmental screening and risk assessment of microplastic contamination in coastal and marine settings.
CAN WE SEE SMALLER? QUANTIFYING less than 100 MICRON MICROPLASTICS WITH PHOTOMICROGRAPHS
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Researchers developed a double-dye optical microscopy technique combining Nile Red and a non-polar UV dye to detect and quantify microplastic particles smaller than 100 microns, a size class often missed in standard analyses. The second dye improved detection of previously elusive materials like PVC and rubber tire particles, though practical limitations remain for routine application.
Raman Spectroscopy Based Approaches for Microplastics Investigations
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Researchers reviewed Raman spectroscopy-based approaches — including confocal Raman microscopy, surface-enhanced Raman scattering, and automated imaging — for identifying and characterizing microplastics in environmental samples, highlighting their superior chemical specificity compared to FTIR for sub-10-μm particles. Accurate chemical identification of microplastics at the nanoscale is foundational for both environmental monitoring and toxicological research, as particle composition (polymer type and additives) strongly influences biological harm.
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