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Preliminary study of the source apportionment and diversity of microplastics: taking floating microplastics in the South China Sea as an example
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The abundance, characteristics and diversity of microplastics in the South China Sea: Observation around three remote islands
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Floating microplastics in the South China Sea around three remote islands reached median concentrations of 1.9×10⁵ items/km², with polypropylene dominating and transparent films comprising the majority — pointing to household and agricultural plastic consumption as primary sources. Fish and mollusks in these waters were also found to have ingested microplastics, confirming active bioaccumulation in marine food webs of a region surrounded by high-plastic-use emerging markets.
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This review synthesizes data on microplastic distribution, sources, and sink dynamics across rivers, nearshore zones, and estuaries of the South China Sea, identifying river inputs, industrial discharge, aquaculture, and shipping as major pollution drivers. The findings are significant because the South China Sea's densely populated coastal margins represent a major pathway through which microplastics enter marine ecosystems and regional seafood supplies.
Preliminary study of the source apportionment and diversity of microplastics: Taking floating microplastics in the South China Sea as an example
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Researchers developed a source-specific classification system for floating microplastics in the South China Sea, analyzing surface water samples to estimate contributions from different land-based and ocean-based sources. The work advances understanding of which human activities contribute most to microplastic pollution in this heavily trafficked sea.
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Researchers sampled surface and bottom seawater in the Beibu Gulf of the South China Sea and found microplastic abundances averaging 1.35 items per cubic meter at the surface, with sources traced to fishing, aquaculture, and land-based plastic waste, and polymer hazard indices indicating elevated chemical risk despite low overall pollution load.
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Researchers reviewed 43 studies across 13 Asian countries and found suspended airborne microplastics ranging from 0.017 to 18,880 particles/m³ outdoors and up to 8,865 particles/m³ indoors, predominantly as fibers and fragments of polyethylene, polypropylene, and PET. The pervasiveness of airborne MPs across Asia—from megacities to ocean environments—demonstrates that inhalation is a significant and underappreciated human exposure route for these persistent pollutants.
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