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61,005 resultsShowing papers similar to Ecotoxicological assessment of estuarine surface waters receiving treated and untreated sanitary wastewater
ClearAn ecotoxicological approach for criteria and standards of sanitary effluent control in Brazil
A review of ecotoxicological criteria for effluent release in Brazil found only six states have more protective legislation than federal standards, with emerging contaminants including microplastics not addressed by conventional sewage treatment or most current regulations.
Assessment of Groundwater Contamination in the Southeastern Coast of Brazil: A Potential Threat to Human Health in Marica Municipality
Researchers assessed groundwater contamination in Marica Municipality along Brazil's southeastern coast, finding that rapid urbanization and inadequate sanitation have led to significant sewage pollution. The study suggests that elevated levels of dissolved organic carbon, nutrients, and bacteria in the aquifers pose a potential threat to public health, since groundwater serves as the primary freshwater source for local residents.
Microplastics in surface waters of tropical estuaries around a densely populated Brazilian bay
Researchers found extremely high microplastic concentrations (up to 33,000 items per cubic meter) in ten estuaries around Todos os Santos Bay, Brazil, largely driven by deficient domestic wastewater treatment serving over 3 million residents.
Distribution, sources and consequences of nutrients, persistent organic pollutants, metals and microplastics in South American estuaries
Researchers reviewed the distribution, sources, and environmental consequences of nutrients, persistent organic pollutants, metals, and microplastics in South American estuaries. The study found that inadequate sanitation infrastructure and uncontrolled coastal development are major pollution drivers across the continent, and that microplastics add a relatively understudied dimension to the cumulative contamination burden in these ecosystems.
Microplastics and linear alkylbenzene levels in oysters Crassostrea gigas driven by sewage contamination at an important aquaculture area of Brazil
Researchers found microplastic fibers in oysters from all six farming areas surveyed in southern Brazil, with contamination levels of sewage markers and microplastics correlating with proximity to urban sewage discharge, highlighting risks to both aquaculture quality and food safety.
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.
Saúde ambiental de praias arenosas: distribuição e níveis de contaminação na biodiversidade bêntica
This Portuguese-language study assessed environmental health of sandy beaches in Brazil, measuring microplastic distribution, contamination indices, and bioindicator organisms to evaluate ecological status and identify pollution sources along the coastline.
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.
Zooplankton exposure to microplastic contamination in a estuarine plume-influenced region, in Northeast Brazil
Researchers examined microplastic contamination in estuarine plume waters off the coast of northeastern Brazil and its relationship with zooplankton. The study found significantly higher microplastic abundance during the high rainfall season, with fibers and fragments being the dominant types, and elevated concentrations in river plume areas compared to reef-adjacent waters, indicating land-based sources as major contributors.
Effect of Plastic Ocean Pollution on Marine Life and Human Health in Brazil
This desk-study review examines how plastic ocean pollution affects marine life and human health in Brazil, synthesizing secondary data on contamination pathways and toxicological impacts.
The Consequences of a Lack of Basic Sanitation in the Municipality of Maricá (Rio de Janeiro, Brazil) Resulting in Low Concentrations of Metals but Dissemination of Endocrine Disruptors Through Local Environments: Subsidies for Local Environmental Management
Researchers assessed the consequences of inadequate basic sanitation in Maricá municipality in Rio de Janeiro state, examining how lack of sewage treatment contributes to water contamination and public health risks. The study highlights systemic infrastructure gaps that require urgent investment.
Plastic waste in surface waters of an urban estuary
Researchers assessed plastic waste in the surface waters of the Capibaribe River estuary in Brazil, cataloguing 381 macroplastic items (mostly soft fragments at 83.9%) and 1,757 microplastic particles concentrated in the upper and middle estuary, with advanced degradation stages observed across 90.5% of collected debris.
Identification of microplastics in the sewage treatment plant in a higher education institution
Researchers examined microplastics in the effluent and screening residues of a Brazilian university wastewater treatment plant. The study found microplastics present in both raw sewage and treated effluent, confirming that conventional treatment does not fully remove these particles before water is discharged. This highlights sewage systems as an underappreciated pathway for microplastic contamination reaching the environment.
Metals and metalloid contamination and geochemical normalization factors in surface sediments from an important estuarine system in Southern Brazil
Researchers measured trace metal and metalloid contamination in surface sediments from the Paranaguá Estuarine System in southern Brazil, finding elevated levels near the port. The study establishes contamination baselines useful for monitoring environmental health in this biodiversity-rich but industrially active estuary.
Microplastic pollution in Brazil's coastal marine surface waters: The first macroregional baseline from the global south
Researchers conducted the largest microplastic survey in the Global South, sampling 4,134 surface water sites across 7,500 km of Brazilian coastline, finding the highest concentrations in the Eastern Coastline (16.87 MPs/L) and lowest in the Amazonian Equatorial region (1.29 MPs/L), with spatial patterns driven by hydrodynamic conditions, salinity, proximity to sewage, and anthropogenic inputs.
Determining the Effect of Discharge of the Coastal Wastewater Treatment Plants on the Toxicity of Surface Waters: A Case Study in İstanbul
Researchers evaluated the toxicity of coastal surface waters affected by wastewater treatment plant discharges in Istanbul, assessing how xenobiotic compounds from domestic and industrial sources interact to produce synergistic or antagonistic toxic effects on aquatic ecosystems.
Occurrence of microplastics and heavy metals accumulation in native oysters Crassostrea Gasar in the Paranaguá estuarine system, Brazil
Researchers examined native oysters from the Paranagua estuarine system in Brazil for both microplastic contamination and heavy metal accumulation. They found high levels of microplastics in all oyster samples, along with elevated concentrations of several heavy metals, and observed potential interactions between the two pollutant types. The study raises concerns about the combined exposure risks from microplastics and heavy metals in seafood harvested from polluted estuaries.
The impact of sediment dumping sites on the concentrations of microplastic in the inner continental shelf of Rio de Janeiro/Brazil
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.
Contaminação e toxicidade de microplásticos em uma área de proteção marinha costeira
This Brazilian study assessed microplastic contamination and toxicity in a coastal marine protected area, finding that sandy beaches accumulate plastic particles carried in by the ocean. The research highlights that even protected coastal zones are not immune to microplastic pollution, which can be ingested by marine wildlife and enter food webs.
Microplastics accumulation in an estuarine ecosystem and ecotoxicological effects of plastic leachates on a benthic copepod
Researchers assessed microplastic accumulation over one year in an urbanized zone of the Rio de la Plata estuary in Argentina, and tested effects on local marine organisms. Microplastic concentrations varied seasonally, and ecotoxicity tests confirmed that estuarine organisms experienced measurable stress from ambient contamination levels.
Microbiological Quality of Oysters From an Estuary in Northeast Pará, Brazil, Before and After Purification Process
Researchers assessed the microbiological quality of farmed oysters in a northeastern Brazilian estuary before and after purification. Oysters collected before purification showed elevated fecal contamination, while purification for up to 36 hours reduced microbial loads. The study underscores the importance of depuration for food safety in aquaculture regions affected by sewage.
Microplastic in bivalves of an urbanized Brazilian estuary: Human modification, population density and vegetation influence
Researchers measured microplastic contamination in oysters, clams, and mussels from a heavily urbanized estuary in Brazil, finding that industrial and port activities were stronger predictors of contamination than population density. Clams accumulated the most microplastics, and the study highlights how shellfish from polluted coastal areas can serve as indicators of the microplastic levels humans may be exposed to through seafood.
Occurrence of specific pollutants in a mixture of sewage and rainwater from an urbanized area
Researchers characterized specific pollutants in combined sewage and rainwater from an urban mixed drainage system, identifying microplastics, pharmaceuticals, and other contaminants and assessing their concentrations relative to environmental quality standards.
Holistic assessment of chemical and biological pollutants in a Mediterranean wastewater effluent-dominated stream: Interactions and ecological impacts
Researchers conducted a comprehensive assessment of pollution downstream from a wastewater treatment plant discharge into a Mediterranean river in Spain. They found elevated levels of pharmaceuticals, metals, microplastics, PFAS chemicals, and antibiotic resistance genes below the discharge point, though some recovery occurred within about 500 meters downstream. The study demonstrates that even treated wastewater significantly alters river water quality and microbial communities, highlighting the need for improved treatment technologies.