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61,005 resultsShowing papers similar to Distribution, risk assessment of heavy metals in sediments and their potential risk on water supply safety of a drinking water reservoir, middle China
ClearHeavy Metals and Arsenic in Sediments of Xinfengjiang Reservoir in South China: Levels, Source Identification and Health Risk Assessment
Sediments in China's largest drinking water reservoir contained elevated levels of heavy metals including cadmium and arsenic, primarily from upstream agricultural and mining activities. This finding is concerning because microplastics in the same sediment can adsorb and concentrate these toxic metals, compounding contamination risks.
Distribution pattern and ecological risk assessment of heavy metals in Henan section of the Yellow River
Researchers assessed heavy metal pollution in sediments of the Henan section of the Yellow River, finding elevated concentrations of several metals including cadmium and lead, with ecological risk assessments indicating moderate to high risk in certain areas driven by both natural and anthropogenic inputs.
With spatial distribution, risk evaluation of heavy metals and microplastics to emphasize the composite mechanism in hyporheic sediments of Beiluo River
Researchers mapped heavy metal and microplastic contamination in river sediments in China, finding that cadmium, lead, and arsenic posed the highest contamination risk, while fiber-shaped microplastics under 500 micrometers were most common. Heavy metals were found concentrated on microplastic surfaces through electrostatic attraction and bacterial biofilms, meaning the plastics serve as carriers for toxic metals in the water. This combined pollution is concerning because river sediments can release contaminants into water used for drinking and agriculture.
Distribution and risk assessment of microplastics in a source water reservoir, Central China
Researchers measured microplastic levels at different water depths in a reservoir in central China used as a drinking water source. They found 2 to 14 particles per liter, with polypropylene and polyethylene being the most common types. Middle and bottom water layers showed higher risk levels due to more toxic polymer types, raising concerns about the safety of source water used for drinking.
Occurrence and Ecological Risk Assessment of Heavy Metals from Wuliangsuhai Lake, Yellow River Basin, China
Researchers investigated heavy metal contamination in Wuliangsuhai Lake sediments in China's Yellow River Basin, finding that mercury and cadmium are the main pollutants, with cadmium showing the highest bioavailability due to its exchangeable fraction, and exogenous pollution concentrated in the top 20 cm of sediment cores.
Bioaccumulation effects of microplastics and heavy metals pollutants in the dominant freshwater fish species in the Longkou entry of Raohe River, Lake Poyang Basin
Eight freshwater fish species from a Chinese lake all contained microplastics in their digestive tracts and gills, along with elevated heavy metals in their muscle tissue. The co-occurrence of microplastics and heavy metals in commonly consumed fish raises concerns about compounded food safety risks for people in this region.
Progress in the Research of the Toxicity Effect Mechanisms of Heavy Metals on Freshwater Organisms and Their Water Quality Criteria in China
Researchers reviewed the toxicity mechanisms of heavy metals on freshwater organisms and the development of water quality criteria in China. The study examines how heavy metal pollution threatens both aquatic ecosystems and human health, and discusses the scientific basis for establishing environmental standards that protect freshwater organisms from harmful contaminant levels.
Distribution, Characteristics, and Ecological Risk Assessment of Microplastics and Heavy Metals in Surface Water at Hoa Binh Reservoir
Researchers sampled surface water in Hoa Binh Reservoir, Vietnam, during rainy and dry seasons, finding microplastics at all sites with fiber-dominated assemblages, and documenting co-occurrence with heavy metals including chromium, manganese, and lead.
Interaction and bacterial effects of microplastics pollution on heavy metals in hyporheic sediments of different land-use types in the Beiluo River Basin
Researchers studied how microplastics and heavy metals interact in river sediments across different land-use types in a Chinese river basin. They found that microplastics concentrated more heavily in shallow sediments and that the metals detected on microplastic surfaces were present at much higher levels than in surrounding sediment. The study suggests that microplastics may serve as concentrators and carriers of heavy metal contamination, potentially amplifying pollution risks.
Past Metal(loid) Pollution Records Inferred fromthe Sediments of Bukit Merah Reservoir Perak,Malaysia
This study reconstructed historical metal pollution in Bukit Merah Reservoir in Malaysia by analyzing sediment cores for metal distribution and geochemical indicators, finding evidence of elevated pollution from tin mining and agricultural activities that began in the 1980s and persists in deeper sediment layers.
Impact of microplastics on microbial community in sediments of the Huangjinxia Reservoir—water source of a water diversion project in western China
Researchers examined microplastic contamination and its effects on microbial communities in sediments of the Huangjinxia Reservoir in western China, investigating how microplastic presence alters the composition and function of microbial assemblages in this drinking water source.
An insight into the ecological risks and mitigation of heavy metal pollution in aquatic sediments and marine ecosystems
This review examines heavy metal pollution in aquatic sediments and marine ecosystems, covering contamination sources, ecological risks, and mitigation strategies. The study highlights the deterioration of aquatic zones due to rising pollution from urbanization and industrialization, and discusses how pollutants including microplastics interact with heavy metals to affect biogeochemical cycling and the food chain.
Spatial distributions of macronutrients, heavy metals and microplastics in surface sediments of the mainstem and lakes in the middle part of the Yellow River Basin
Researchers mapped the distribution of macronutrients, heavy metals, and microplastics in sediments along the middle section of the Yellow River and adjacent lakes in China. They found that microplastic concentrations ranged from 233 to 3,333 items per kilogram in river sediments, with nylon as the dominant polymer type. Contamination levels increased significantly after the river flowed through intensive agricultural areas, with urban lakes showing the highest heavy metal concentrations.
Environmental Behaviors, Ecological Risks, and Toxic Mechanisms of Emerging and Legacy Contaminants in China: From Distribution to Management
Researchers reviewed the environmental distribution, ecological risks, and toxic mechanisms of both emerging and legacy contaminants in China's aquatic environments, examining how industrialization and urbanization drive the co-occurrence and combined pollution that threatens ecosystem integrity and human health.
Microplastics as an emerging anthropogenic vector of trace metals in freshwater: Significance of biofilms and comparison with natural substrates
Scientists placed virgin polystyrene microplastics in a eutrophic urban lake and a drinking water reservoir for four weeks to allow biofilm development, then measured trace metal accumulation, finding that biofilm-coated microplastics accumulated significantly more metals than virgin plastics or natural substrates.
Bioaccumulation and Biomagnification (The Subtle Processes that Question our Survival)
This review synthesizes mechanisms of bioaccumulation and biomagnification in aquatic ecosystems, examining how heavy metals, microplastics, and other toxicants concentrate up food chains and pose escalating risks to ecological balance and human health.
Bioaccumulation and Bioremediation of Heavy Metals in Fishes—A Review
This review summarizes how heavy metals accumulate in fish tissues through contaminated water and enter the human food chain, posing serious public health concerns. The paper discusses bioremediation techniques using microorganisms and other methods to remove heavy metals from aquatic environments, which is relevant because microplastics can carry and concentrate these same toxic metals.
Identification Sources and High-Risk Areas of Sediment Heavy Metals in the Yellow River by Geographical Detector Method
Scientists measured heavy metal contamination in river sediments of the Yellow River in Inner Mongolia, identifying industrial emissions and agricultural activities as the main sources. While focused on heavy metals, the research is relevant because microplastics frequently co-occur with and transport heavy metal pollutants in river systems.
Spatial distribution characteristics, ecological risk assessment, and source analysis of heavy metal(loid)s in surface sediments of the nearshore area of Qionghai
Analysis of 93 surface sediment samples from the nearshore area of Qionghai found heavy metal contamination from natural weathering, agricultural, and industrial sources, with geo-accumulation indices and ecological risk assessments identifying priority elements of concern.
Distribution and effects of microplastics as carriers of heavy metals in river surface sediments
Researchers investigated microplastic contamination in river sediments of an urban canal in Zhenjiang City, China, finding an average abundance of over 2,000 particles per kilogram across seasons. The study found that microplastics acted as carriers for heavy metals like cadmium, copper, and lead, with factors such as polymer type, particle size, and surface weathering influencing adsorption capacity. Evidence indicates that smaller, more weathered microplastics in sediments may concentrate higher levels of toxic metals.
Microplastic Pollution in the Inlet and Outlet Networks of Rawa Jombor Reservoir: Accumulation in Aquatic Fauna, Interactions with Heavy Metals, and Health Risk Assessment
Microplastics were detected in the inlet and outlet streams of the Rawa Jombor Reservoir in Java, Indonesia, along with accumulation in aquatic fauna and interactions with heavy metals, and a human health risk assessment was conducted for communities consuming local fish. The study identifies the reservoir network as both a microplastic accumulation zone and a pathway for human dietary exposure to plastic-associated contaminants.
Occurrence Characteristics and Ecological Risk Assessment of Microplastics in Aquatic Environments of Cascade Reservoirs Along the Middle-Lower Han River
The occurrence characteristics and ecological risk of microplastics were assessed in a specific environment, providing spatial distribution data and risk indices. Such assessments are important for establishing baseline contamination levels and identifying sites requiring remediation.
Multiple evaluations, risk assessment, and source identification of heavy metals in surface water and sediment of the Golmud River, northeastern Qinghai-Tibet Plateau, China
This study assessed heavy metal concentrations in surface water and sediment of the Golmud River on the Qinghai-Tibet Plateau, identifying pollution sources and evaluating ecological risks to this environmentally sensitive region.
Assessment of ecological risk for ecosystems caused by dredged materials in freshwater environments
Researchers assessed ecological risks posed by chemical contaminants in dredged freshwater sediments, evaluating metals, organic pollutants, and emerging contaminants including microplastics across multiple risk metrics to inform safe disposal and management decisions.