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Microplastic in Brazilian sediments: Systematic review of coastal and marine areas for a national monitoring program
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Seasonal Variations in Microplastic Pollution in Beach Sediments along the Eastern Coast of Rio de Janeiro State, Brazil
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A survey of 27 beaches along Rio de Janeiro's eastern coast found microplastics on every beach, with winter counts (2,987 particles) nearly five times higher than summer (562 particles), driven by seasonal wind and wave dynamics, with fragments and fibers of polyethylene and polypropylene dominating. The seasonal variation reveals that MP exposure for coastal wildlife and beachgoers fluctuates dramatically with environmental conditions, complicating risk assessments tied to any single sampling window.
Microplastics Beach Pollution: Composition, Quantification and Distribution on the Southern Coast of Brazil
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Researchers quantified microplastic pollution on a southern Brazilian beach, finding an average of 650 MPs/kg of sediment with highest concentrations near the Mampituba River mouth, dominated by polyethylene, polypropylene, and polyamide particles in the 50–100 µm range. The findings confirm that riverine transport is a major pathway delivering microplastics to coastlines, underscoring the need for upstream source control to protect coastal ecosystems.
Microplastics in Brazilian aquatic ecosystems and seafood: An updated review
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This review pulls together 100 studies to show that Brazil's rivers, bays, and coastal waters are widely contaminated with tiny plastic particles called microplastics, mostly from clothing fibers and packaging. Seafood like fish, shellfish, and crustaceans are absorbing these particles, sometimes in huge amounts, which raises real concerns for anyone eating fish from these waters. The bigger picture: plastic pollution levels swing a lot depending on rainfall and tourist seasons, and scientists still need better, more consistent testing methods to fully understand how much risk this poses to human health.
Microplastic contamination in marine sediment from different regions of the Blue Amazon, Bahia, Brazil
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Researchers surveyed marine sediment microplastic contamination across four coastal regions of Bahia, Brazil, finding widespread pollution averaging 270 items per kilogram with fibers predominating and higher concentrations near densely populated areas like Salvador. The study fills an important data gap for South American coastal ecosystems and shows that population density is a strong predictor of sediment microplastic load.
Understanding Microplastic Pollution in Riverbed Sediments: Special Emphasis on a Medium-Sized City in the State of São Paulo, Brazil
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Sediment samples from an urban stream in Rio Claro, Brazil showed microplastic concentrations up to 18,000 units per kilogram — among the highest reported in Brazil — with fibers and tire wear particles as the dominant types, driven by untreated sewage and stormwater runoff. The extreme pollution levels in a mid-sized city highlight that microplastic contamination is not confined to megacities, posing risks to water quality in smaller urban centers.
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