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High Salinity Promotes the Aging of Polystyrene Microplastics with Humic Acid in Seawater
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Researchers modeled the chemical and hydrolytic aging of polyamide 6 in seawater using a new kinetic model that tracks chain scission and embrittlement, identifying the ductile-to-brittle transition as the physical threshold for microplastic fragment formation, while DNA metabarcoding revealed that bacterial communities colonizing the polymer surface shift distinctly depending on polymer type and weathering state.
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This study examined how sunlight breaks down polystyrene microplastics in water with different salt levels and dissolved organic matter. The combination of salt and humic acid accelerated the aging of microplastics, making them smaller and more chemically reactive. This matters because aged microplastics can more easily absorb toxic pollutants and are small enough to be taken up by organisms, increasing potential health risks.
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