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Supplementary material to "From salinity to nanoplastics: redefining safe yield in strip-island aquifers under emerging contaminant threats"
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From salinity to nanoplastics: redefining safe yield in strip-island aquifers under emerging contaminant threats
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On small islands, drinking water comes from thin layers of freshwater floating above saltwater underground, and cities decide how much to pump based on the risk of saltwater creeping in. This study found that tiny plastic particles (nanoplastics) move through this groundwater very differently than salt does, spreading faster and reaching wells sooner than salinity models would predict—meaning current pumping guidelines may not actually protect against plastic contamination in drinking water. The findings suggest island water systems need new safety rules that specifically account for nanoplastics, not just salt, to keep tap water safe.
From salinity to nanoplastics: redefining safe yield in strip-island aquifers under emerging contaminant threats
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A multi-physics numerical model reveals that nanoplastics migrate through island freshwater aquifers fundamentally differently from dissolved salts, arriving at extraction wells earlier and creating broader contamination zones than salinity-based safe-yield frameworks predict. This work demonstrates that existing groundwater management policies designed around saltwater intrusion will systematically underestimate nanoplastic contamination risk to drinking water on small islands.
Protection of Underground Aquifers from Micro- and Nanoplastics Contamination
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Researchers reviewed the mechanisms by which micro- and nanoplastics infiltrate underground aquifers through soil transport, adsorption, and leaching, and assessed strategies to protect groundwater sources from this emerging and poorly regulated contaminant class.
Protection of Underground Aquifers from Micro- and Nanoplastics Contamination
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Researchers reviewed the pathways through which micro- and nanoplastics infiltrate underground aquifers and evaluated current and proposed strategies to protect these critical freshwater reserves, finding that soil filtration provides partial protection but that nanoplastics can bypass conventional barriers and persist in groundwater for extended periods.
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.
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