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Closing the Millimetric Sampling Gap Through a Portable Modular Microplastic Fractionation Platform
Summary
Scientists have built a new portable filter that can accurately capture "millimeter-sized" microplastic particles (about the size of a grain of rice down to a pinhead) from water sources — a size range that's been notoriously hard to measure with existing tools. In lab tests, the device caught over 99% of these plastic particles while letting other debris pass through, which means researchers can now get more accurate readings on how much plastic pollution of this size is actually in our water. Better detection tools like this are an important step toward understanding how much microplastic we might be exposed to through drinking water and the environment, even though this study doesn't yet tell us about health effects
ABSTRACT: Accurate quantification of millimetric-range microplastics in aquatic environments remains a methodological challenge, with particles in the 1–5 mm interval frequently underrepresented due to limited field-deployable fractionation tools. This study presents the design, hydrodynamic configuration, and laboratory validation of the FC5 modular microplastic fractionation device, a compact portable device for selective isolation of millimetric-range particles from liquid matrices. Performance was evaluated across five experimentally distinct matrices representing aquatic and engineered water systems. The test matrices included clean mixed-plastic suspensions, mineral turbidity, organic fouling, combined particulate stress, and extreme particulate loading. System performance was assessed using three principal metrics: separation efficiency, recovery efficiency, and processing time. The FC5 achieved mean separation efficiencies of 99.17–100% and recovery efficiencies of 93.93–99.17% across a cumulative dataset of 660 polypropylene particles, with coefficients of variation below 1.46% indicating high reproducibility. Processing time remained stable under realistic conditions, with increased flow resistance only under extreme loading scenarios. The majority of non-target particulate matter passed selectively through the outlet stream across all matrices, confirming size-specific fractionation. As a modular extension of a previously validated fine-fraction sampling device, FC5 enables size-resolved microplastic collection within the 1–5 mm range. This integrated architecture supports harmonized microplastic monitoring across the full particle size spectrum, applicable to a wide range of aquatic and industrial environments.