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61,005 resultsShowing papers similar to Metals and metalloid contamination and geochemical normalization factors in surface sediments from an important estuarine system in Southern Brazil
ClearTrace Metal Levels in Muscles and Exoskeleton of Pink Shrimp (Penaeus brasiliensis and paulensis) from a Subtropical Coastal Region, Laguna Estuarine System, Brazil
Researchers used pink shrimp as bioindicators to monitor heavy metal contamination in an estuarine environment in Brazil, finding elevated levels of several trace metals. Heavy metals and microplastics often co-occur in marine environments, with microplastics acting as carriers for toxic metals in aquatic food webs.
Study of Heavy Metals and Microbial Communities in Contaminated Sediments Along an Urban Estuary
Researchers studied heavy metal contamination and microbial community composition in estuarine sediments along an urban waterway, finding that urbanization-driven metal accumulation significantly altered microbial diversity and community structure.
Ecotoxicological assessment of estuarine surface waters receiving treated and untreated sanitary wastewater
Researchers monitored water quality in a Brazilian estuary receiving both treated and untreated sewage over 18 months and found that contaminant levels consistently exceeded national standards, with ecotoxicity tests on native marine organisms confirming significant biological harm especially near direct wastewater discharge points.
Preliminary Determination of Heavy Metals in Sediment, Water, and Some Macroinvertebrates in Tawi-Tawi Bay, Philippines
Researchers conducted a preliminary assessment of heavy metal concentrations in sediment, water, and macroinvertebrates at multiple sites in Tawi-Tawi Bay in the Philippines. The study establishes baseline data on chemical pollution in this understudied coastal area.
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.
Metal Transport in the Mixing Zone of an Estuarine River to the Northern Gulf of Mexico
Researchers measured total recoverable metal concentrations along the lower Calcasieu River in Louisiana, which flows through petrochemical industrial areas into the Gulf of Mexico. Heavy metals carried by rivers often adsorb to microplastics, and this study characterizes the metal pollution load entering this coastal zone.
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.
Contaminant Characteristics and Influencing Factors of Heavy Metals in Seawater and Sediments in a Typical Mariculture Bay in South China
Researchers assessed heavy metal contamination in seawater and sediments of Qinzhou Bay, a major mariculture area in South China, finding seasonal variations in metal concentrations influenced by river input, aquaculture activities, and hydrodynamic conditions.
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.
Transfer of industrial contaminants from the inner to the outer region of Sepetiba Bay (SE Brazil) by dredge spoil dumping activities: a temporal record
Researchers analyzed a sediment core from Sepetiba Bay, Brazil, to reconstruct approximately 170 years of environmental change driven by industrial contamination and dredge spoil dumping. The study found progressive increases in organic matter and potentially toxic elements in the outer bay region, along with evidence of subsurface gas indicating eutrophication. Evidence indicates that dredging activities have transferred industrial contaminants from the inner to the outer region of the bay over time.
Relationship between Potential Trace Elements Contamination in Sediment and Macrofauna in the Upper Gulf of Thailand
Researchers monitored five heavy metals in sediments and sandworms in the upper Gulf of Thailand, finding contamination levels that provide an indication of coastal environmental quality and the extent to which bottom-dwelling fauna accumulate trace element pollution.
Microplastics and suspended particles in a strongly impacted coastal environment: Composition, abundance, surface texture, and interaction with metal ions
Researchers analyzed suspended particulate matter composition and microplastic characteristics in the inner zone of Bahia Blanca Estuary, Argentina during winter, finding that microplastics interact with metal ions in this heavily impacted coastal environment and documenting for the first time the combined contamination profile of this industrial waterway.
Relationship between microplastics and heavy metals in Tam Giang-Cau Hai lagoon sediments
Researchers investigated the distribution and interactions of microplastics and ten heavy metals in sediments of the Tam Giang-Cau Hai Lagoon in Vietnam, finding moderate microplastic contamination and using Spearman correlation and PCA to assess relationships between sediment properties, metal concentrations, and plastic abundance. The study provides baseline data for understanding co-pollution dynamics in this coastal lagoon ecosystem.
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.
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.
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.
A first assessment of microplastic abundance in sandy beach sediments of the Paranaguá Estuarine Complex, South Brazil (RAMSAR site)
Researchers conducted the first assessment of microplastic abundance in sandy beach sediments at 19 sites within the Paranaguá Estuarine Complex in South Brazil, finding 398 microplastic particles dominated by foam, hard fragments, and paint chips across this ecologically sensitive RAMSAR-listed wetland.
Microplastics in brazilian marine environments: a study on beaches in São Francisco do Sul - SC
Beach surveys along São Francisco do Sul in southern Brazil confirmed widespread microplastic presence in coastal sediments, with polymer composition reflecting regional plastic waste streams. The study adds to the body of evidence that Brazilian coastlines are significantly contaminated and calls for national monitoring standards to track and manage the problem.
Interactions Between Heavy Metals and Microplastics in Surface Marine Sediments, Chanthaburi River Mouth, Eastern Gulf of Thailand
Researchers assessed heavy metal and microplastic contamination in surface marine sediments from the mouth of Thailand's Chanthaburi River, finding interactions between metal pollutants and plastic particles that affect contaminant bioavailability and ecological risk in estuarine environments.
Meso- and microplastic composition, distribution patterns and drivers: A snapshot of plastic pollution on Brazilian beaches
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.
Spatial variability in the concentrations of metals in beached microplastics
This study measured heavy metal concentrations in microplastic pellets collected from 19 beaches in Brazil, finding that beach pellets had significantly higher metal loads than virgin plastic pellets. The results confirm that microplastics accumulate metals from seawater over time, increasing their potential toxicity to marine organisms.
Ecological risk assessment of microplastics and heavy metals in Northern Vietnam's estuarine sediments: A case study of Ba Lat and Bach Dang
Researchers assessed microplastic abundance and ecological risk alongside ten heavy metals in estuarine sediments from the Ba Lat and Bach Dang estuaries of northern Vietnam's Red-Thai Binh River system, finding co-contamination patterns that pose compounded ecological risks to these biodiverse coastal ecosystems.
Vertical Distribution of Potentially Toxic Metals and PAHs in the Alvarado Lagoon, Veracruz in the Southern Gulf of Mexico
Researchers analyzed sediment profiles spanning several decades from the Alvarado Lagoon in Mexico to assess contamination by trace metals and polycyclic aromatic hydrocarbons. They found no evidence of significant metal enrichment or pollution, with element concentrations attributable to natural geological origins. The study provides baseline environmental data useful for monitoring future contamination in this ecologically important lagoon system.
Presence and quantification of the microplastics and bisphenol-A in sediments along the Guanabara Bay, Brazil
This study found both microplastics and bisphenol-A (BPA) in sediments across Guanabara Bay, Brazil, one of the country's most important estuarine systems. The co-occurrence of plastic particles and a hormone-disrupting chemical raises serious concerns for aquatic life and seafood consumers.