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A cost-effective protocol for detecting fluorescent microplastics in arable soils to study redistribution processes
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Researchers developed a low-cost, chemical-free method to track how microplastics move through agricultural soil and into waterways by using fluorescent plastic particles as tracers and detecting them under ultraviolet light, achieving over 85% recovery accuracy and providing a practical tool for studying plastic pollution transport in farming landscapes.
Understanding microplastics' (MPs) transport from soils to aquatic ecosystems is challenging due to labor-intensive detection methods, especially in large-scale plot experiments analyzing surface runoff and soil erosion. To address this, we used fluorescent MPs as tracers and developed a cost-effective protocol to detect them in dry soils and eroded sediments. We analyzed spherical polyethylene (PE: 125–150 μm; 425–500 μm) and irregular polylactic acid (PLA: 125–150 μm; 250–300 μm). Sample assays were prepared primarily based on dry and wet sieving. Subsequent darkroom photography under 365 nm illumination, and thresholding and segmentation-based image analysis were done. The developed protocol demonstrates high reliability, precision, and F-scores of 88.7 % ± 2.9 %, 85.2 % ± 3.1 %, and 86.9 % ± 2.8 %. PE exhibited slightly higher recovery rates (85 % ± 5 %) than PLA (79 % ± 8 %). Particle size influenced recovery, with larger MPs achieving significantly higher recovery. Smaller particles showed slightly lower recovery under dry soil conditions, but their recovery improved under sediment conditions facilitated by wet sieving and ultrasonication. All fluorescent MPs retained >95 % detectability after three months of storage, highlighting marker temporal stability. Compared to existing methods, this protocol eliminates complex digestion steps, reduces costs, and ensures minimal contamination, providing a robust framework for MP transport studies. It offers potential for enhancement through advanced imaging and machine learning, enabling more efficient and accessible detection in environmental research. • Technique to enhance fluorescent microplastic as tracers for transport studies. • The technique is simple, low cost, and has high accuracy. • Soil and sediment matrices are analyzed. • Non-destructive analysis of samples based on size fractionation. • Image processing of UV-illuminated darkroom photographs to detect microplastics.
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Researchers developed a simplified protocol using fluorescent microplastic particles to enable rapid detection and enumeration of MPs in agricultural soil and sediment without extraction, achieving approximately 90% recovery for 100-500 micrometer polyethylene and polylactic acid particles using size fractionation.
A fluorescence-based protocol for quantifying microplastics in soil: Protocol optimization and field investigation
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Scientists developed a more reliable way to measure tiny plastic bits (microplastics) hiding in soil, using a special dye and safer chemicals to separate plastic from dirt without over- or under-counting. When they tested farmland, a landfill, and a park, farmland actually had the most microplastic contamination, a concerning finding since this is where our food is grown, meaning these plastics could potentially make their way into crops and eventually our diets. Better detection methods like this one are a key step toward understanding how much plastic pollution is in the soil that grows our food and assessing what risks it might pose to human health.
Isolation and Identification of Microplastic Particles From Agricultural Soil and Its Detection By Fluorescence Microscope Technique
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Researchers isolated and identified microplastic particles in agricultural soil at different depths using fluorescence microscopy, finding that microplastics are present in terrestrial farm environments and can move vertically through soil profiles — an important finding for food safety and soil health.
Separation and Identification of Conventional Microplastics from Farmland Soils
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Researchers developed a low-cost, accessible method for extracting and identifying microplastics from farmland soils using density separation, fluorescent staining, and infrared spectroscopy. The protocol achieved recovery rates between 82% and 101% across different soil types and particle sizes. This standardized approach could help scientists worldwide compare results more reliably and give policymakers better data on agricultural microplastic contamination.
Detecting and monitoring the leaching of small (¡ 2 µm) microplastics in soils by fluorescence microscopy
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Researchers compared fluorescence microscopy and mu-Raman spectroscopy for detecting the smallest microplastic fraction (1-2 µm) in soils of varying matrix complexity, then used fluorescent microplastics in field conditions to directly measure leaching rates of small particles through soil profiles. The study demonstrated that fluorescence microscopy enables detection and tracking of sub-2 µm microplastics in field soils, providing a practical method for studying the dynamics of the smallest, most mobile plastic fraction in terrestrial environments.
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