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Author response for "Assessing microplastics, per- and polyfluoroalkyl substances (PFAS), and other contaminants of global concern in wadable agricultural streams in Iowa"
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Assessing microplastics, per- and polyfluoroalkyl substances (PFAS), and other contaminants of global concern in wadable agricultural streams in Iowa
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Researchers surveyed small agricultural streams across Iowa for multiple contaminants and found microplastics in water, sediment, and fish at every site tested. PFAS (forever chemicals), antibiotic resistance genes, and pharmaceuticals were also widely detected across the same streams. This study shows that even small rural waterways in agricultural regions carry a cocktail of emerging pollutants that could affect both ecosystems and the communities that rely on them.
Ubiquitous Microplastics in Fluvial Sediments of Urban Stream Systems in Davenport and Bettendorf, Iowa
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Researchers documented pervasive microplastic contamination in fluvial sediments across urban stream systems in Davenport and Bettendorf, Iowa, identifying fibers and fragments from synthetic textiles and packaging as dominant particle types. Urban waterways function as persistent microplastic sinks and sources, accumulating particles during low flow and flushing them downstream during storm events — a cycle that continuously redistributes contamination through river networks.
Research Gaps and Future Directions for Addressing Microplastics and PFAS: Impacts in Aquatic Environments
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This review identifies critical knowledge gaps in understanding how microplastics and PFAS (forever chemicals) interact and cause harm in aquatic environments after more than seven decades of production. Addressing these gaps is urgent because both contaminants persist indefinitely, accumulate in living organisms, and are now detectable in virtually every aquatic environment on Earth.
Microplastic Concentration and Type in a Central Illinois Urban Stream
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Researchers measured microplastic concentrations in a small urban stream in central Illinois and found levels orders of magnitude higher than those in major rivers like the Chicago or Danube, with downstream concentrations reaching 2,000 particles per cubic meter. The findings suggest small urban waterways may be underestimated but significant pathways for funneling microplastics into larger water systems.
Watershed Characteristics Affect Microplastic Concentrations in a Central Illinois Urban Stream
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Researchers found that small urban streams can contain far higher microplastic concentrations than large rivers, with a central Illinois stream averaging 122 microplastics per cubic meter — suggesting that urban runoff and storm drainage are major, often underestimated sources of microplastic pollution in freshwater systems.
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