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61,005 resultsShowing papers similar to Microplastic Accumulation in Urban Stream Sediments: Vertical Distribution and Transport Dynamics
ClearOccurrence and transport of microplastics across the streambed interface during bank filtration
Researchers assessed microplastic occurrence and spatial distribution across surface water, riverbed sediments, and groundwater at two German lowland river sites -- the Teltow Canal and the Havel -- under bank filtration conditions, collecting monthly surface water and quarterly groundwater samples over one year alongside sediment freeze cores to 100 cm depth, analyzed by near-infrared spectroscopy.
A depth-resolved snapshot of microplastic abundances in riffle heads in a gravelbed river
Researchers took depth-resolved samples from gravel riverbed sediments to map how microplastics distribute vertically through streambeds. They found significant quantities at depth, suggesting that riverbeds act as long-term reservoirs of microplastic pollution rather than just transient transport pathways.
Microplastic Distribution at Different Sediment Depths in an Urban Estuary
Researchers sampled sediment cores from an urban estuary to map how microplastic particles are distributed at different depths over time. The study found that microplastic density varied with sediment depth, reflecting historical changes in plastic pollution and urban runoff.
Riverbed depth-specific microplastics distribution and potential use as process marker
Researchers examined the depth-specific distribution of microplastics in riverbed sediments, finding that particle concentration and type varied significantly with sediment depth. The findings suggest that riverbeds act as significant microplastic sinks, with deeper layers representing older accumulation zones.
New insights into the vertical distribution and microbial degradation of microplastics in urban river sediments
Vertical distribution and microbial degradation of microplastics in sediment cores were investigated, finding that microplastics were present throughout the vertical profile and that indigenous microbial communities were actively interacting with plastic particles. The study provided new insights into how sediment depth, redox conditions, and microbial activity shape microplastic fate in sediment repositories.
Distinct microplastic patterns in the sediment and biota of an urban stream
Researchers found distinct microplastic contamination patterns between sediments and aquatic biota in an urban stream, with sediments accumulating more particles while biota showed selective uptake based on particle size and shape, highlighting the complex dynamics of microplastic distribution in urban freshwater systems.
Effects of seasonal variation and resuspension on microplastics in river sediments
Researchers measured microplastic concentrations in river sediments across multiple seasons and examined the role of resuspension events, finding that MP levels varied significantly by season and that high-flow events released previously deposited particles, redistributing contamination downstream.
Assessing the Behavior of Microplastics in Fluvial Systems: Infiltration and Retention Dynamics in Streambed Sediments
Scientists used laboratory river-bed simulations to study how microplastics move from surface water down into streambed sediments. Smaller particles (1 micrometer) penetrated deeper into the sediment than larger ones, and higher water flow pushed more particles downward. This research helps explain how microplastics accumulate in river beds, which serve as both drinking water sources and habitats for aquatic organisms.
Classification of microplastic characteristics in surface water and sediments in the lower Mekong river (Vietnam) in the dry season
Researchers analyzed microplastic distribution and polymer composition at 17 locations along the Mekong River in Vietnam during the April 2024 dry season, collecting samples from both surface water and riverbed sediments and characterizing them by optical microscopy and FTIR spectroscopy. They found that microplastic densities were higher in more urbanized areas and were influenced by geographical location, transportation activities, population density, and local hydrological characteristics.
Longitudinal and Vertical Transport of Microplastic Within Sediment in Rivers and Transitional Water Environments
Researchers investigated the longitudinal and vertical transport of microplastics within sediments in rivers and transitional water environments, developing models to quantify how sediment presence affects microplastic mobility and their transport toward coastal areas.
Co-occurrence of microplastics and heavy metals to urban river sediments: The vertical distribution characterization and comprehensive ecological risk assessment
Researchers studied how microplastics and heavy metals are distributed at different depths in urban river sediments and found that pollution risk actually increases deeper in the sediment. Polyethylene fragments were the most common type of microplastic found, and the combination of microplastics with heavy metals like zinc, arsenic, and cadmium creates a compounded ecological risk. These findings suggest that looking only at surface sediment may underestimate the true extent of pollution in urban waterways.
Microplastics in urban New Jersey freshwaters: distribution, chemical identification, and biological affects
Researchers characterized microplastics in the heavily urbanized Raritan and Passaic Rivers in New Jersey, identifying polymer types at 15 sites using pyrolysis-GC/MS and finding that associated organic compounds can transfer between plastic and water phases, with embryonic zebrafish exposed to identified polymers showing physiological effects.
Distribution and transport of microplastic and fine particulate organic matter in urban streams
Researchers found that urban streams both transport and retain microplastic and fine particulate organic matter, using particle transport dynamics methods to quantify retention rates and identify streams as significant intermediary sinks in the plastic pollution pathway to oceans.
Vertical Distribution of Microplastics in the Water Column and Surficial Sediment from the Milwaukee River Basin to Lake Michigan
Microplastics were measured in water surface, water subsurface, and sediment samples along the Milwaukee River continuum to Lake Michigan, finding density-dependent vertical distribution with low-density polymers concentrated at the surface and high-density polymers in sediments. The study demonstrates a clear polymer partitioning pattern with depth in freshwater systems.
Quantifying and Characterizing Microplastics in the Greater Philadelphia Region
Researchers quantified and characterized microplastic contamination across waterways in the Greater Philadelphia region, examining how plastic degradation from weathering, heat, water, and biological activity introduces microplastics into local water bodies and the atmosphere. The study assessed the scope of contamination and documented the implications of microplastic pollution for aquatic and human health in an urban watershed context.
Revealing microplastic dynamics: the impact of precipitation and depth in urban river ecosystems
Microplastic abundance was monitored at different depths and during different precipitation events in urban rivers in Brazil, finding that rainfall significantly increases MP concentrations and that deeper water layers can carry higher loads than surface water.
Abundance, Distribution and Drivers of Microplastic Contaminant in Urban River Environments
Researchers surveyed microplastic distribution in urban river environments and identified key drivers of accumulation hotspots, finding that land use, hydrology, and infrastructure factors concentrated microplastics at predictable locations that could inform targeted management interventions.
Impact of land cover on microplastics accumulation in freshwater sediments
Researchers collected sediment cores from four Pennsylvania watersheds with different land uses to examine how land cover influences microplastic accumulation in freshwater sediments over time. Urban and agricultural watersheds showed higher microplastic concentrations than forested watersheds, with fibers being the most common morphotype.
Spatio-vertical distribution of riverine microplastics: Impact of the textile industry
Microplastic distributions were mapped vertically and spatially along a river impacted by the textile industry, finding elevated fiber concentrations near industrial discharge points and in deeper river sediment layers. The study links textile manufacturing to localized microplastic hotspots and documents vertical accumulation patterns in riverine sediments.
Trapped microplastics within vertical redeposited sediment: Experimental study simulating lake and channeled river systems during resuspension events
Researchers simulated sediment resuspension events to study how microplastics of different densities, sizes, and shapes become trapped within redeposited sediment layers, finding that particle properties strongly influence vertical redistribution patterns in lake and river systems.
Investigations on microplastic infiltration within natural riverbed sediments
Researchers used laboratory flume experiments to investigate how sediment grain size affects the infiltration of four types of microplastics (PET spheres, PET ellipsoids, polystyrene fragments, and polyamide fibers) into riverbed sediments. Sediment particle size, microplastic shape, and density were key factors controlling how deeply microplastics penetrate into the hyporheic zone.
Spatio-temporal trends in microplastic presence in the sediments of the River Thames catchment (UK)
A 30-month study tracked microplastic concentrations in sediments across the River Thames catchment in the UK, finding an average of 61 items per kg dry weight with sub-millimeter polyethylene fragments dominating. Industrial land use near sampling sites was associated with elevated microplastic concentrations and distinct polymer types.
Spatial distribution and vertical characteristics of microplastics in the urban river: The case of Qinhuai River in Nanjing, China
Researchers investigated the spatial distribution and vertical characteristics of microplastics in the Qinhuai River in Nanjing, China. The study found an average concentration of about 668 microplastic items per liter, with abundance patterns varying between surface and deep water at different points along the river, and identified correlations between microplastic presence and shifts in microbial community structure.
Concentration Depth Profiles of Microplastic Particles in River Flow and Implications for Surface Sampling
This study measured microplastic concentration depth profiles in river flow and found that particles are not uniformly distributed in the water column, with implications for sampling strategy and the accuracy of estimates of total microplastic transport.