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61,006 resultsShowing papers similar to The Promotion/Inhibition of the Seepage Transport of Copper Ions by Suspension-Colloidal Particles with Wide Size Gradation
ClearInfluence of Soil Colloids on Ni Adsorption and Transport in the Saturated Porous Media: Effects of pH, Ionic Strength, and Humic Acid
Soil colloids — tiny particles naturally suspended in soil water — were found to significantly influence the transport of nickel through saturated sandy media. The presence of colloids increased nickel mobility, and the effect varied with pH, ionic strength, and humic acid content. Understanding colloid-facilitated metal transport is important for assessing how nickel and other heavy metals spread from contaminated sites into groundwater.
Transport characteristics of DNA-tagged silica colloids as a colloidal tracer in saturated sand columns; role of solution chemistry, flow velocity, and sand grain size
Researchers evaluated DNA-tagged silica colloids as environmental tracers in saturated sand columns and found their transport behavior closely matched conventional colloid transport theory, validating their use for tracking subsurface water flow and contaminant pathways.
Effect of background ions and physicochemical factors on the cotransport of microplastics with Cu2+ in saturated porous media
Researchers used column experiments to study how polystyrene microplastics transport copper ions through saturated porous media under different ionic conditions. They found that microplastics effectively act as carriers for copper, with UV-aged and oxygen-aged particles showing even stronger transport capacity than pristine ones. The study demonstrates that microplastics in groundwater systems can facilitate the spread of heavy metal contamination by carrying pollutants through soil.
Fate and cotransport of Pb(II) and Cd(II) heavy ions with bentonite colloidal flow in saturated porous media: The role of filter cake, counter ions, colloid concentration, and fluid velocity
Researchers studied how colloidal bentonite clay particles transport lead and cadmium heavy ions through porous sand, simulating conditions near oil and gas drilling waste sites. They found that the formation of an external filter cake significantly delayed heavy ion breakthrough and reduced outlet concentrations of cadmium and lead by 86% and 93% respectively. The study suggests that colloid-mediated transport is a key mechanism for heavy metal migration in contaminated groundwater environments.
[Transport and Model Calculation of Microplastics Under the Influence of Ionic Type, Strength, and Iron Oxide].
Laboratory column experiments showed that calcium ions strongly inhibit the transport of polystyrene microplastics through quartz sand via bridging and charge neutralization effects, while iron oxide coatings on sand grains further reduce microplastic mobility through surface adsorption. Understanding these transport dynamics is important for predicting how microplastics move through soil and groundwater systems and assessing contamination risks to drinking water sources.
Effects of soil grain size and solution chemistry on the transport of biochar nanoparticles
Researchers investigated how soil grain size and solution chemistry affect the transport of biochar nanoparticles through soil, finding that both factors significantly influence mobility and that accurate transport predictions are essential for safely scaling up biochar soil applications.
Impact of nanoplastic debris on the stability and transport of metal oxide nanoparticles: role of varying soil solution chemistry
Researchers investigated how nanoplastic debris affects the stability and transport of copper oxide nanoparticles in soil solutions extracted from three soil types, finding that nanoplastic presence significantly reduced nanoparticle aggregation and sedimentation rates and dramatically increased nanoparticle mobility through soil columns, raising concerns about combined contamination enhancing metal nanoparticle spread in terrestrial environments.
Experimental Confirmation of the Interception History Paradigm for Colloid (Micro and Nanoparticle) Transport in Porous Media
Laboratory experiments confirmed the interception history paradigm for colloid filtration under chemically unfavorable conditions, demonstrating that microplastics and other colloidal particles follow predictable deposition patterns in porous media—providing mechanistic data relevant to modeling MP transport through soils and aquifers.
SiO2 and microparticle transport in a saturated porous medium: effects of particle size and flow rate
Column experiments tracking the movement of polystyrene microplastic particles and silica particles through saturated gravel showed that larger particles are retained more strongly, but higher water flow rates push both types deeper into the porous medium. At the same flow rate, 10-micrometer polystyrene particles were retained 46% more effectively than 2-micrometer particles, illustrating how particle size and water velocity interact to control microplastic transport through subsurface environments. Understanding these dynamics is important for predicting how microplastics reach groundwater and spread through aquifer systems.
Impact of particle density on the mobility of microplastics in sediments
This study investigates how the density of microplastic particles affects their mobility through soil and potential to reach groundwater, using column experiments with polyethylene particles of different densities. Particle density was found to influence transport behavior, with implications for understanding how microplastics migrate through terrestrial environments.
Effects of clay minerals on the transport of nanoplastics through water-saturated porous media
Column experiments with clay-containing saturated porous media showed that clay minerals reduced nanoplastic transport by enhancing particle retention through bridging flocculation and charge neutralization, with kaolinite having greater retention effects than montmorillonite, informing predictions of nanoplastic mobility in clay-rich soils.
Concentration‐ and Size‐Dependent Influences of Microplastics on Soil Hydraulic Properties and Water Flow
Researchers investigated how microplastic concentration and particle size affect soil hydraulic properties and water flow. They found that microplastic contamination reduced saturated conductivity by up to 50% and inhibited water infiltration, with higher concentrations and larger particle sizes leading to weaker soil water-holding capacity.
Effect of shape on the transport and retention of nanoplastics in saturated quartz sand
Researchers compared the transport of spherical versus toroid-shaped nanoplastics through quartz sand columns, finding that irregular toroid particles traveled significantly less far than spheres due to lower energy barriers and greater tendency to accumulate along pore walls — highlighting that particle shape must be considered when predicting nanoplastic fate in soil and groundwater.
Effect of Preferential Microplastics Leaching Through Macropores on Vertical Soil Particle Transport
Using packed soil columns with artificial macropores of 2, 3, and 4 mm, researchers investigated how macropore size affects the leaching of microplastics with different shapes and polymer types under rainfall simulations. Macropore size significantly influenced microplastic transport, with larger macropores enabling faster and more extensive particle migration.
Dispersion properties of nanoplastic spheres in granular media at low Reynolds numbers
Researchers measured how nanoplastic spheres of different sizes (100-1000 nm) move through porous granular media at low flow rates, finding that existing models significantly underestimate the dispersion of colloidal-sized nanoplastics. Size exclusion effects reduced the mobility of larger nanoplastics in fine-grained sediments, with implications for predicting nanoplastic transport in soils and groundwater.
Effects of co-present mineral colloids on the transport of microplastics in porous media: The key role of hydrochemical and hydrodynamic conditions
Scientists studied how tiny plastic particles (microplastics) move through soil and sand when mixed with natural clay particles. They found that the combination of different clay types and water conditions can either help microplastics travel further underground or trap them in place. This research helps us better understand how microplastics might contaminate groundwater sources that provide our drinking water.
Impact of particle size and oxide phase on microplastic transport through iron oxide-coated sand
Researchers studied how different types of iron oxide coatings on sand affect the movement of polystyrene microplastics through soil. They found that magnetite-coated sand retained the most microplastics, while goethite-coated sand retained the least, with results matching theoretical predictions. The findings suggest that naturally iron-rich soils could serve as effective barriers to prevent microplastic transport through groundwater systems.
Natural organic matter and ionic strength (CaCl2) affect transport, retention and remobilization of silica encapsulated DNA colloids (DNAcol) in saturated sand columns
This paper is not directly about microplastics — it studies how natural organic matter and calcium chloride ionic strength affect the transport and remobilization of DNA-tagged silica colloid surrogates in saturated sand columns, providing insights into colloidal particle behavior in porous media.
Transport and deposition of microplastic particles in saturated porous media: Co-effects of clay particles and natural organic matter
Researchers performed column experiments to study how clay particles and natural organic matter affect microplastic transport through saturated porous media, finding that both colloids reduced MP mobility through heteroaggregation and that their combined presence produced the greatest reduction in transport.
Effect of deposition, detachment and aggregation processes on nanoparticle transport in porous media using Monte Carlo simulations
Researchers developed a 3D computational model to study how engineered nanoparticles move through porous soil and sediment, accounting for deposition, detachment, and aggregation. Similar models can be applied to understand how nanoplastics and small microplastics move through groundwater systems.
Current understanding of subsurface transport of micro‐ and nanoplastics in soil
This review summarizes current knowledge about how micro- and nanoplastics are transported through soil subsurface environments. Researchers discuss the fundamental mechanisms governing plastic particle movement in soils, including size-dependent filtration, preferential flow through macropores, and interactions with soil colloids. The study highlights significant gaps in understanding how plastics migrate through different soil types and may eventually reach groundwater.
An insight into laboratory column experiments for microplastic transport in soil
This review synthesizes findings from laboratory column experiments on microplastic transport through soil, examining how particle size, shape, surface chemistry, and soil properties influence how far plastics migrate in the subsurface.
Experimental and simulated microplastics transport in saturated natural sediments: Impact of grain size and particle size
Researchers tested how microplastics of different sizes move through natural soil and sediment layers, finding that smaller particles (10-20 micrometers) passed through easily while larger ones got trapped. In gravel, over 85% of the smallest microplastics made it through the sediment column. This means microplastics on the land surface can gradually leach down into underground aquifers that supply drinking water, representing a potential route of human exposure.
Transport of polystyrene nanoplastics in natural soils: Effect of soil properties, ionic strength and cation type
Researchers used column experiments across three soil types to show that polystyrene nanoplastic transport is governed by soil iron and aluminum oxide content and pH — with high-pH, low-oxide soils allowing up to 97% nanoplastic passage — and that calcium ions and higher ionic strength significantly increase retention, revealing that soil chemistry strongly controls nanoplastic mobility toward groundwater.