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Comparative Analysis of Microplastic Contamination in Groundwater: Alluvial vs. Karst Aquifers
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Urban Land Use Sources Microplastic Pollution to Karst Aquifers
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Microplastics were detected in karst groundwater springs across Missouri at levels up to 15 particles per liter, with contamination significantly correlated with urban land cover in the recharge area. This study demonstrates that urban land use drives microplastic infiltration into karst aquifers, threatening groundwater resources that millions of people depend on for drinking water.
Microplastics in Karst Groundwaters of Illinois
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Researchers sampled 17 springs and shallow wells across karst aquifers in Illinois, detecting microplastics — exclusively microfibers — in all but one sample at concentrations up to 15.2 pieces per liter, with septic effluent from washing machines identified as the most likely contamination source.
Groundwater: An Endangered Invisible Resource. Microplastic Pollution in Underground Karst Systems, from Surface Watercourses to Cave Waters
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This study traced microplastic pollution through underground karst systems, from surface watercourses into cave waters and aquifers, finding that even these concealed environments are contaminated despite being a major global drinking water source. The discovery that microplastics infiltrate karst groundwater suggests that a significant fraction of the world's population consuming groundwater may face previously unrecognized microplastic ingestion exposure.
The Plastiverse Extends to Hydrogeologic Systems: Microplastics Are an Important Emerging Groundwater Contaminant Class
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Scientists are finding tiny plastic particles, called microplastics, in groundwater, the water stored underground that many communities rely on for drinking water. This matters because groundwater has long been considered relatively protected from surface pollution, so this research suggests we need to start paying closer attention to how these plastics get into our water supplies and what that could mean for our health down the road. More research is still needed to fully understand the risks, but this is an important first step in recognizing groundwater as another place where microplastic contamination shows up.
Microplastic Contamination of a Karst Spring During Flooding
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Researchers tracked microplastic levels in a karst spring during a flood event and found concentrations fluctuated dramatically — reaching up to 107 particles per liter — suggesting that heavy rain can flush significant amounts of plastic into groundwater sources used for drinking water.
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