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The impact of sediment dumping sites on the concentrations of microplastic in the inner continental shelf of Rio de Janeiro/Brazil
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Microplastics were found in bottom sediments on Brazil's Rio de Janeiro continental shelf, in an area impacted by dredged materials and untreated sewage. The distribution of particles suggests both local accumulation and transport from highly polluted Guanabara Bay, showing how urban pollution spreads into offshore areas.
The marine environment is constantly being impacted by anthropogenic activities. Nowadays, microplastics (MPs) representing one of the most deleterious material among of all substances and material from anthropogenic origin. The Microplastics (MPs) are particles smaller than 5 mm. This study presents information on abundance, distribution, type and colour of microplastics in the bottom sediments of the continental Shelf of Rio de Janeiro State. This area is strongly impacted due to its location in front of one of the most polluted coastal bays in the Brazilian Coastline. It receives untreated sewage from an Ipanema Beach submarine emissary and also a great amount of sediments dredged from Rio de Janeiro Harbour, which strongly influences the distribution of MPs in the area. The analyses detected the presence of MP in 100% of the samples, composed mainly by secondary microplastics, and almost 50% were fibers, followed by plastic films, plastic fragments and pellets. Based on the nature of the sources of the MP, a great variety of colours was shown, dominated by four main colours: blue, white, transparent, and black, this pattern could potentially increase their bioavailability due to resemblance to prey items, especially to visual raptorial species.
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Assessment of microplastic in beaches of Guanabara Bay, Rio de Janeiro, RJ, Brazil
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Brazilian researchers analyzed beach sediments at three sites around Guanabara Bay in Rio de Janeiro for microplastic contamination, separating and characterizing plastic debris by size, color, and type. The study contributes to understanding microplastic pollution levels in one of Brazil's most urbanized and ecologically stressed coastal bays.
Microplastic in the sediments of a highly eutrophic tropical estuary
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Researchers quantified and characterized microplastics in sublittoral sediments of Guanabara Bay, a highly eutrophic tropical estuary in Brazil, finding widespread contamination with fibers and fragments at concentrations reflecting the bay's heavy urbanization and poor waste management.
Meso- and microplastic composition, distribution patterns and drivers: A snapshot of plastic pollution on Brazilian beaches
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A standardized survey of plastic pollution across 22 sandy beaches spanning over 4600 km of Brazilian coast found widespread contamination in coastal sediments, with polymer type, size, and distribution patterns reflecting diverse sources including fishing activity and urban runoff.
Estudo Sobre Microplásticos Em Águas Superficiais Na Porção Oeste Da Baía De Guanabara
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This Brazilian study measured microplastic concentrations in surface waters of the western portion of Guanabara Bay, documenting widespread contamination in this heavily urbanized tropical bay. The results characterize the types and distribution of microplastics in suspension and raise concerns about their adsorption of organic contaminants and entry into local food chains.
The influence of dynamics and different uses on the distribution and origin of microplastics on the coast of Ilha Grande, Angra dos Reis (RJ)
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This Portuguese study analyzed microplastic pollution patterns on the coastline of Ilha Grande, Rio de Janeiro, Brazil, examining distribution, types, and likely sources. The research provides a diagnostic baseline for understanding plastic contamination in this coastal area.
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