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Occurrence, characteristics, and multiple ecological risks of microplastics in surface water-sediment system of the Yangtze River basin, China
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Scientists studying China's Yangtze River—a major water source for millions of people—found tiny plastic particles (mostly from packaging and textiles) throughout both the water and the sediment at the bottom of rivers and lakes. While the overall risk level appears low right now, certain hotspot areas showed heavy contamination, and some of the plastic types found are considered more hazardous, suggesting that ongoing monitoring and pollution control are still important for protecting water quality that eventually affects the food and water people consume.
Microplastics (MPs) pollution poses a significant threat to large river basins, yet a systematic assessment within the water-sediment system of the Yangtze River Basin (YRB) has been lacking. This work systematically analyzed and assessed the occurrence, distribution, and risks of MPs across four media within the YRB based on synthesized published data, employing both deterministic index and uncertainty probability methods: river water (RSW), lake/reservoir water (LRSW), and their corresponding sediments (RS and LRS). The average abundance was 2203.17 items/m 3 in surface water and 437.04 items/kg in sediments, showing correlated yet spatially heterogeneous patterns, with the Chengdu section of the Minjiang River and lakes in the middle and lower reaches of the YRB identified as significant pollution zones. Dominant MPs were small-sized (75.56%), transparent (39.75%), fibrous (57.75%) particles composed mainly of PP (37.25%) and PE (23.75%). Correlation analyses between influencing factors and MPs characteristics revealed that human activities distinctly affected MPs characteristics in each medium. Deterministic ecological risk assessment (DERA) indicated low pollution load and potential risk, but high polymer hazards. In contrast, the probabilistic ecological risk assessment (PERA) indicated that the overall probability of ecological risk in the YRB is relatively low, with high-hazard polymers contributing significantly to MPs risks, while also reducing the uncertainty associated with the DERA. This study systematically and scientifically revealed the ecological risk status of MPs in the YRB, providing the scientific basis for targeted management measures.
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This study mapped microplastic pollution throughout the Yangtze River Basin in China and found an average of 611 particles per kilogram of sediment, with wide variation across locations. Smaller microplastics under 1 millimeter and fibrous shapes were most common, and contamination was closely linked to population density and human activities. The findings are concerning because the Yangtze River system provides drinking water and food resources to hundreds of millions of people.
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Researchers compiled data on microplastic pollution across the entire Yangtze River Basin in China and found that contamination levels vary significantly by region, with urban and industrial areas showing the highest concentrations. The ecological risk assessment revealed that microplastics in certain stretches of the basin pose a notable threat to aquatic organisms. This basin-wide view helps identify pollution hotspots where intervention could most benefit both ecosystems and the communities that rely on the river.
Occurrence of microplastics pollution in the Yangtze River: Distinct characteristics of spatial distribution and basin-wide ecological risk assessment
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Researchers analyzed microplastic pollution across the entire Yangtze River basin, compiling data from the headwaters to the estuary to create a comprehensive picture of contamination. They found distinct spatial distribution patterns, with higher concentrations in urban and industrialized stretches of the river. The study also conducted a basin-wide ecological risk assessment, finding moderate to high risk levels in several sections.
Microplastics in Surface Water in the Yangtze River, China: Basin-Wide Observation, Multiple Ecological Risk Assessment and Sustainability
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Researchers conducted a three-year survey of microplastic pollution across the entire Yangtze River Basin in China and found an average of nearly 8,800 microplastic particles per cubic meter of surface water. Tiny particles smaller than 0.3 millimeters made up over 92% of what was found and drove the variation in pollution levels between locations. The study highlights that previous research may have significantly underestimated microplastic contamination by not capturing these smallest particles.
[Pollution Characteristics and Ecological Risk Assessment of Microplastics in the Yangtze River Basin].
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A comprehensive survey of the Yangtze River basin — the longest river in China — found microplastics at abundances ranging from 21 to over 44,000 particles per cubic meter, with the highest concentrations in urban tributary areas like Chengdu. Fibers and fragments under 1 mm were most common, and statistical analysis linked microplastic abundance strongly to vehicle ownership and tourism activity. The study found that roughly 69% of sampled areas fall within elevated ecological risk categories, with Taihu Lake identified as a particular hotspot.
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