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Microplastic Contamination of the Mississippi River in Illinois: Sources, Environmental Drivers, and Risk Assessment
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Scientists found tiny plastic particles, mostly plastic fibers, likely from clothing and textiles, in every single water sample they tested from the Mississippi River in Illinois, with levels varying quite a bit from site to site. Since this river provides drinking water to millions of people, these findings matter because they help pinpoint pollution hotspots and their possible sources, which is a first step toward understanding how much of these particles might end up in our water supply and, ultimately, in us.
Microplastic pollution has become a major concern for the environment in freshwater ecosystems due to its persistence, distribution, and impacts. However, research about microplastic pollution in the Illinois portion of the Mississippi River and its tributaries is still limited. This research examined the occurrence, geographical distribution, properties, and potential sources of microplastics in the Mississippi River and its major tributaries in Illinois. Surface water samples from 24 locations were collected and examined by stereomicroscopy to detect and quantify microplastics. The relationships between microplastic levels and physicochemical and land cover variables were examined using Spearman’s rank correlation. Microplastics were identified at every sampling site, with concentrations ranging from 4.5 to 76 particles per liter (average: 25.95 ± 18.15 particles/L), and fibers comprised over 71% of the total particles. Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) analysis identified four types of polymers: nylon, polystyrene, polypropylene, and high-density polyethylene. Microplastic levels exhibited a negative correlation with dissolved oxygen (ρ = −0.617) and a direct correlation with pH (ρ = 0.500). The results include fundamental data about microplastic pollution at specific sites throughout the Illinois portion of the Mississippi River and emphasize possible correlations between microplastic levels, adjacent land cover, and water quality parameters.
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Identification and Quantification of Microplastic Pollution in Water Samples and Four Species of Fish from the Mississippi River
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Microplastics were found in water samples and in four fish species from the Mississippi River, the largest North American river draining a densely populated watershed. The findings confirm that one of the world's major river systems is contaminated with microplastics, which are likely entering the Gulf of Mexico.
Characterization and enumeration of microplastic pollution in three fish species of the Upper Mississippi River
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Researchers found 891 microplastic particles across 281 fish from three species in the Upper Mississippi River, with fibers being the most common type and smaller fish containing proportionally more microplastics than larger ones. This confirms microplastic ingestion is widespread in freshwater fish — not just marine species — and the presence of styrene-isoprene, polyester, and ABS polymers highlights the diverse plastic sources contaminating major river systems.
Microplastic in surface waters of urban rivers: concentration, sources, and associated bacterial assemblages
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Researchers measured microplastic levels in the surface waters of the Chicago River and its urban tributaries, finding concentrations as high as 1.94 particles per cubic meter near wastewater outflows. They discovered that microplastic fibers and pellets were often colonized by bacterial communities distinct from those in the surrounding water. The study provides early evidence that urban rivers are significant conduits for microplastic pollution and that these particles may serve as rafts for microorganisms.
Microplastic Contamination in Water Bodies: Sources, Fate, and Ecological Impacts in Native Rivers
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Tiny plastic bits are ending up in rivers, even remote ones far from cities, coming from trash breakdown, wastewater, and even air. This review of existing research shows these particles can harm river life by physically injuring them and releasing or carrying harmful chemicals, which matters because these same waterways often feed into our drinking water and food supply. Scientists still need better tools to measure the problem and stronger policies to stop plastic pollution at its source.
Microplastic Concentrations and Types in a Central Illinois Urban Stream
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Researchers sampled microplastic concentrations in a small urban stream and its tributaries in central Illinois, finding widespread contamination with higher levels near more urbanized land use. The study also detected seasonal variation in concentrations, adding to evidence that small urban waterways are significant pathways for plastic pollution reaching larger water bodies.
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