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Investigation of Anthropogenic and Emerging Contaminants in Sinkholes (Cenotes) of the Great Mayan Aquifer, Yucatán Peninsula
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Researchers sampled 10 cenotes and one submarine groundwater discharge site on Mexico's Yucatan Peninsula, finding a wide range of contaminants including elevated lead and nitrate, multidrug-resistant E. coli strains, and PFAS compounds in the majority of sites. The interconnected karst hydrology of the region allows contaminants to travel long distances through the aquifer, raising serious concerns about water safety for the millions who rely on these systems for drinking water and recreation.
Karst water bodies are vital groundwater resources particularly vulnerable to pollution. Protecting their water quality requires documenting contaminants traditionally associated with anthropogenic activities (metals, nutrients, and fecal indicator bacteria) as well as emerging contaminants, such as antibiotic-resistant organisms (AROs) and perfluoroalkyl substances (PFAS). This study detected contaminants in karst-associated water bodies on the Yucatán Peninsula, including 10 sinkholes (cenotes) and one submarine groundwater discharge (SGD) site. The concentrations of metals (strontium, cadmium, nickel, lead), nutrients (phosphate, silicate, ammonium, nitrate, and nitrite), and fecal indicator bacteria (fecal coliforms, Escherichia coli) were consistent with previous reports, sometimes exceeding recommended standards for groundwater or the protection of aquatic life. This included elevated lead (80.3 µg/L) and nitrate (413 μmol/L) concentrations at two cenotes, and elevated E. coli levels (167 - 1800 CFU/100 mL) in five cenotes. Additionally, 34 antibiotic-resistant E. coli strains were identified in nine cenotes and most strains were multidrug-resistant. Perfluorooctanesulfonic acid (PFOS) and perfluorohexanoic acid (PFHxA) were also detected in eight cenotes and the SGD, with total PFAS concentrations from 0.68 to 10.71 ng/L. The absence of associations between contaminants and urban cover suggests karst hydrology influences contaminant cycling-stable isotope signatures (δ18O, δ2H) confirming that most systems are interconnected to regional groundwater flows, that could allow contaminants to travel long distances. The Yucatán Peninsula's karst is an important freshwater reservoir used for consumption and recreation; the presence of contaminants and the karst's vulnerability to their spread raises concerns and highlights the need for continued monitoring and conservation.
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Cenotes, the natural sinkholes that supply drinking water across Mexico's Yucatán Peninsula, are picking up more pollution as nearby towns and cities grow. Researchers found more microplastics, "forever chemicals" (PFAS), and toxic metals like cadmium and arsenic in cenotes surrounded by more development, likely because wastewater isn't being properly treated before it seeps into the water. Since millions of people and visitors rely on this groundwater for drinking, this suggests that unchecked construction and weak sewage systems could be putting a shared water supply—and the people who depend on it—at ris
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Contaminación por microplásticos en el acuífero kárstico de la península de Yucatán
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Researchers sampled water from cenotes and wells throughout the Yucatan karst aquifer and identified microplastic particles in every groundwater sample, with fibers comprising 94% of particles and concentrations ranging from 10 to 936 particles per liter, establishing that this primary regional drinking water source is universally contaminated with microplastics.
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Scientists testing groundwater in Mexico's Yucatan Peninsula, a region that relies entirely on underground water for drinking, found 57 chemical contaminants, mostly traces of pharmaceuticals and plastic-related compounds, in both wastewater and treated drinking water. Concerning, even the drinking water treatment plant showed these chemicals, and treatment processes didn't fully eliminate them, suggesting current water treatment may not catch everything before it reaches your tap. This matters because it highlights gaps in monitoring "emerging contaminants," chemicals we don't yet fully understand the health eff
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Scientists found tiny plastic fibers inside blind cave creatures living deep in underground water pools (called cenotes) in Mexico's Yucatán Peninsula—the first time this has been documented. This matters because these cenotes are a major source of drinking water for the region, so finding plastic contamination this deep underground suggests our water supplies may be more polluted with microplastics than we realized, even in places that seem remote and protected.
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