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61,005 resultsShowing papers similar to Microplastics in sediment samples from the mouth of the Amazon River
ClearMicroplastics in sediment samples from the mouth of the Amazon River
Researchers detected and characterized microplastics in sediment samples from the mouth of the Amazon River, collecting ten samples across the North and South channels in October 2021 and analyzing them with micro-FTIR and micro-Raman spectroscopy. They found microplastic concentrations ranging from 99 to 894 particles per 100 g dry weight sediment, with considerable variation in morphological dimensions and chemical composition between sampling locations.
Microplastics in distal sediments from the mouth of the Amazon River
Researchers conducted a preliminary assessment of microplastic distribution in distal sediments from the mouth of the Amazon River, motivated by prior evidence that the Amazon plume is the largest source of organic plastic additives in the tropical North Atlantic region.
Microplastics in distal sediments from the mouth of the Amazon River
Researchers conducted a preliminary assessment of microplastic distribution in distal marine sediments near the mouth of the Amazon River, examining how the Amazon plume — a major source of plastic additives in the tropical North Atlantic — contributes to regional microplastic deposition patterns.
Widespread microplastics distribution at an Amazon macrotidal sandy beach
Researchers found widespread microplastic contamination at a macrotidal sandy beach on the Amazon coast of Brazil, detecting an average of 492.5 particles per square meter with fibers dominating across three depth strata down to 60 cm.
Preliminary Assessment of Plastic Litter and Microplastic Contamination in Freshwater Depositional Areas: The Case Study of Puerto Misahualli, Ecuadorian Amazonia
Researchers conducted a preliminary assessment of plastic litter and microplastics in sediments at a riverine depositional area in the Ecuadorian Amazon, finding low-density polyethylene bags as the dominant macroplastic and documenting microplastic presence in an upper Amazon basin location.
Microplastics in sediments from Amazon rivers, Brazil
Microplastics were detected in river sediments throughout the Amazon Basin near Manaus, Brazil, at concentrations up to 8,178 particles per kilogram of dry sediment, with the highest levels near shallow, slow-moving sections of the Negro River adjacent to the city. This is the first documentation of widespread microplastic contamination in the Amazon river system.
Microplastic in the sediments of a highly eutrophic tropical estuary
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.
Comprehensive risk assessment of microplastics in tidal channel sediments in amazonian mangroves (northern Brazil)
Researchers assessed microplastic pollution in mangrove sediments along an estuary in the Brazilian Amazon, finding contamination at all nine sampling sites with an average of 433 particles per kilogram. While the contamination was classified as low-level, the presence of microplastics in this remote Amazonian ecosystem shows the global reach of plastic pollution. Mangroves are critical nursery habitats for fish and shellfish, so contamination here could affect seafood safety for local communities.
First evidence of microplastic ingestion by fishes from the Amazon River estuary
Researchers documented the first evidence of microplastic ingestion by fish in the Amazon River estuary, finding plastic particles — predominantly polyamide and polyethylene pellets — in 30% of 189 specimens across 14 species, with larger fish containing more particles, indicating widespread contamination extending into one of the world's most biodiverse river systems.
Microplastics in sediments of the Pantanal Wetlands, Brazil
Researchers investigated microplastic concentrations, sizes, and distribution factors in fluvial sediments of the Cuiabá River within Brazil's Pantanal Wetlands — the world's largest flooded savanna — finding microplastics present and identifying hydrological and anthropogenic variables influencing their spatial distribution.
First assessment of microplastic and artificial microfiber contamination in surface waters of the Amazon Continental Shelf
Researchers characterized microplastics in surface water of the Amazon Continental Shelf for the first time, finding particles at all 57 sampling sites with higher concentrations during the rainy season. Polyamide, polyurethane, and acrylonitrile butadiene styrene were the most common polymer types, and concentrations were highest near river mouths and coastal cities.
Vertical distribution of microplastics in mangrove sediment in a tropical estuarine region.
Researchers characterized vertical microplastic distribution in sediment cores from mangrove fringe sites in the Piraque-Acu and Piraque-Mirim estuary in eastern Brazil, finding concentrations ranging from 80 to 960 items per kg dry weight using a saline flotation and vacuum filtration protocol.
Vertical distribution of microplastics in mangrove sediment in a tropical estuarine region.
Researchers characterized vertical microplastic distribution in sediment cores from mangrove fringe sites in the Piraque-Acu and Piraque-Mirim estuary in eastern Brazil, finding concentrations ranging from 80 to 960 items per kg dry weight using a saline flotation and vacuum filtration protocol.
Microplastic Identification and Density In Coastal Sediments of Manado Bay
Researchers identified and quantified microplastics in coastal sediments of Manado Bay, documenting the density and polymer types of plastic particles accumulating in the marine environment from anthropogenic activities.
Dispersão de microplásticos em águas superficiais e sedimentos de fundo da plataforma continental de Fortaleza
Researchers examined the distribution and characteristics of microplastics in surface waters and bottom sediments of the continental shelf off Fortaleza, Brazil, characterizing MP abundance and morphology to assess contamination levels in this South American marine environment.
Contamination and characterization of microplastics in different sediments of the river estuaries (the inner Gulf of Thailand)
Researchers measured microplastic contamination in river estuary sediments in the inner Gulf of Thailand, finding widespread contamination at all sites. The study characterizes the types and abundance of microplastics in a highly trafficked coastal region of Southeast Asia.
Distribution and occurrence of microplastics in estuaries of São José Bay, Brazilian equatorial margin
Researchers examined the distribution and occurrence of microplastics in estuaries of São José Bay on the Brazilian equatorial margin, characterizing MP abundance, morphology, and polymer composition across multiple sampling sites.
Plastic pollution in freshwater ecosystems: macro-, meso-, and microplastic debris in a floodplain lake
Researchers surveyed macro-, meso-, and microplastic debris in a South American floodplain lake and found an average of 704 microplastic particles per square meter in sediments, with plastic contamination comparable to marine beaches — demonstrating that freshwater lakes can be major plastic pollution reservoirs.
Microplastic in an Urbanized Estuary on the Brazilian Equatorial Margin: Analysis of Contamination in Commercially Intent Fish, Water and Sediment in the Anil River
Researchers analyzed microplastic contamination in fish, water, and sediment samples from the Anil River estuary on the Brazilian Equatorial Margin, focusing on commercially important fish species in an urbanized estuarine environment.
Assessment, characterization, and quantification of microplastics from river sediments
Researchers assessed microplastic contamination in sediments from 14 sites along the Kaveri River in South India, characterizing particle types, sizes, and polymer compositions to quantify the extent of microplastic pollution in this freshwater system.
Widespread microplastic pollution in mangrove soils of Todos os Santos Bay, northern Brazil
Researchers found widespread microplastic pollution in mangrove soils around Todos os Santos Bay in Brazil, detecting contamination at multiple depths and distances from the tidal area, highlighting mangroves as previously overlooked sinks for microplastic accumulation.
Microplastic pollution of Patos Lagoon, south of Brazil
Researchers detected microplastics for the first time in Patos Lagoon in southern Brazil — the largest lagoon in South America — finding particles of polyethylene and other plastics in filtered water samples, confirming that this major freshwater ecosystem is already contaminated.
Microplastics and the Amazon: from the Rivers to the Estuary
This review described the main routes of microplastic input into Amazonian rivers and how local environmental characteristics affect the transformation and transport of plastics through the Amazon basin to the estuary.
Microplastic concentrations in beach sediments along the German Baltic coast
Researchers measured microplastic contamination on beaches along the German Baltic coast near river estuaries and tracked seasonal variation over several months, finding contamination at all sites. The study highlights that river mouths are hotspots for microplastic deposition on coastal beaches.