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Dynamics of plastic debris and its density change between river compartments in the Tuul River system, Mongolia
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This study tracked the dynamics of plastic debris density changes as material moves between river compartments — from riverbanks to surface water to riverbed — finding that weathering progressively increases apparent density and causes particles to sink. Density change is a key driver of plastic fate in river systems.
Plastic pollution in river environments has become an emerging global concern. However, the migration of plastic and changes in its properties between river compartments are less understood. This study demonstrates the plastic debris aging and the dynamics between floodplain, surface water, and sediment compartments of the Tuul River, Mongolia. Plastic occurrence is evaluated in terms of their abundance, size, shape, polymer type, and photodegradation in each compartment. Photodegradation stages were calculated using the carbonyl index (CI). Plastic abundance was 5.46 ± 3.53 items m-2 in the floodplain, 155 ± 100.7 items m-3 in the surface water, and 128.4 ± 76.3 items kg-1 in the sediment. Microplastics dominated in the size category in all compartments, while macro- and megaplastics were found only in the floodplain. Polyethylene and polypropylene dominated the surface water and sediment, while polystyrene was the predominant plastic in the floodplain. A positive correlation was found between the distributed polymer types in the surface water and sediment compartments. The similar composition in size and polymer type suggests vertical plastic migration from water to sediment. Although CI values showed that the plastic aging was significantly different between water and sediment (water, 0.61 ± 0.26, and sediment, 0.90 ± 0.68), the dominance of low-density plastics with high CI in the sediment suggests that the aged plastic density changed during the vertical transport in the river system.
More Papers Like This
Dynamics of plastic debris and its density change between river compartments in the Tuul River system, Mongolia
AI summary Read the abstract
Researchers investigated the migration dynamics and aging of plastic debris between floodplain, surface water, and sediment compartments of the Tuul River in Mongolia. The study characterized plastic occurrence by abundance, size, shape, polymer type, and photodegradation across river compartments to understand how plastic properties change during transport.
The microplastic dynamics between river surface water and sediment compartments
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Researchers monitored plastic distribution in surface water and bottom sediment along the urban Tuul River in Mongolia in August 2022 and 2023 at nine sampling sites, using a plankton net for water sampling and measuring river flow rates to determine plastic fluxes. They found strong compositional similarities between water and sediment compartments in dominant plastic types — polyethylene and polypropylene films and fragments — and observed that severe flooding in July 2023 dramatically increased plastic loads in surface water by 1.5 to 539 items per cubic meter compared to the prior year.
Transport of aged microplastics in river confluence zones: Settling behavior and influencing factors
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Scientists studying how tiny plastic bits move where rivers meet found that weathering (aging) and water turbulence change whether these particles float along or sink to the riverbed, with plastic type and density mattering too. This matters because it helps predict where microplastics build up in waterways, which can affect drinking water sources and the aquatic food chain that eventually reaches our plates.
The role of biofilm and hydrodynamics on the fate of microplastic particles in rivers: an experimental study
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Researchers conducted flume and field experiments to examine how biofilm formation and hydrodynamic conditions govern the fate of microplastic particles in rivers, investigating why some MP-polluted rivers crossing industrialized areas show no significant upstream-to-downstream concentration differences. The study identified biofilm-mediated density changes and turbulence as key factors controlling whether low-density MPs remain suspended or settle into sediments.
Quantifying microplastic particle transport and retention in an experimental flume environment
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Researchers conducted flume experiments to quantify how microplastic particles of different shapes and densities are transported and retained in artificial river channels under controlled flow conditions. The results show that particle shape and flow dynamics strongly interact to determine where microplastics settle or remain suspended in river systems.
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