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Seasonal dynamics and typology of microplastic pollution in Huixian karst wetland groundwater: Implications for ecosystem health
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Researchers tracked microplastic levels in groundwater beneath a karst wetland in China across seasons, finding contamination ranging from about 1 to 49 particles per liter. The unique cave-and-underground-river geology of karst regions allows microplastics to migrate from the surface into groundwater more easily than in other terrains, with agricultural runoff and domestic wastewater identified as the main pollution sources.
This study offers an insightful and detailed examination of microplastic pollution in the Huixian karst wetland's groundwater, providing novel insights into the complex interplay of microplastic characteristics and their seasonal dynamics. We meticulously quantified microplastic concentrations, observing significant seasonal variation with values ranging from 4.9 to 13.4 n·L in the wet season and 0.53-49.4 n·L in the dry season. Our analysis pinpoints human activities and atmospheric deposition as key contributors to this contamination. A critical finding of our research is the pronounced disparity in microplastic levels between open wells and covered artesian wells, highlighting the vulnerability of open wells to higher pollution levels. Through correlation analysis, we unearthed the crucial influence of the karst region's unique hydrogeological characteristics on microplastic migration, distinctively different from non-karst areas. The karst terrain, characterized by its caves and subterranean rivers, facilitates the downward movement of microplastics from surface to groundwater, exacerbating pollution levels. Our investigation identifies agricultural runoff and domestic wastewater as primary pollution sources. These findings not only underscore the urgent need for environmental stewardship in karst regions but also provide a crucial foundation for formulating effective strategies to mitigate microplastic pollution in karst groundwater. The implications of this study extend beyond the Huixian karst wetland, offering a template for addressing microplastic pollution in similar ecosystems globally.
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Spatial distribution characteristics and migration of microplastics in surface water, groundwater and sediment in karst areas: The case of Yulong River in Guilin, Southwest China
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Researchers investigated microplastic distribution in surface water, sediment, and groundwater in the karst landscape of the Yulong River in Guilin, China. They found microplastic pollution across all water compartments, with living areas showing the highest contamination and tourism-related disposable plastics identified as a primary source. The study suggests that microplastics reach groundwater through hydraulic exchange with surface water in karst areas rather than through soil infiltration.
Preliminary Study on the Distribution, Source, and Ecological Risk of Typical Microplastics in Karst Groundwater in Guizhou Province, China
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Researchers surveyed microplastic contamination in karst groundwater across Guizhou Province, China, finding concentrations ranging from about 2 to 10 particles per liter. The dominant types were polystyrene and polyethylene, primarily in film and fiber forms. The study found that rainfall events significantly increased microplastic abundance and movement in karst groundwater, and that most sampling sites showed low ecological risk under normal conditions.
Extensive abundances and characteristics of microplastic pollution in the karst hyporheic zones of urban rivers
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Researchers found high microplastic abundances — averaging 2,273 items per kilogram — in river sediments across ten karst cities in southwest China, with polyamide the dominant polymer, highlighting the elevated pollution risk in karst ecosystems where contaminants travel long distances underground.
Microplastic particles in karst and alluvial aquifers
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Researchers studied microplastic particle occurrence and distribution in karst and alluvial aquifer systems, investigating how these subsurface environments serve as sinks or conduits for plastic pollution. The study contributed data on groundwater microplastic contamination in geologically distinct aquifer types.
Distribution, sources, and transport of microplastics in a karst river of Southwest China
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Researchers sampled the Wuma River, a karst river in Southwest China, and found microplastics (mostly fragments under 100 micrometers) in both surface water and sediments, with polyurethane and PET as the dominant polymers. The unique geology of karst landscapes — featuring underground river networks, large boulders, and overflow dams — was shown to significantly affect where microplastics accumulate and how far they travel downstream. Residential activity, agriculture, and road tire wear were identified as the main sources. Understanding how karst systems trap and redistribute microplastics matters because these landscapes supply drinking water to millions of people.
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