Experimental and simulated microplastics transport in saturated natural sediments: Impact of grain size and particle size

Journal of Hazardous Materials, Год журнала: 2024, Номер 468, С. 133772 - 133772

Опубликована: Фев. 10, 2024

Microplastics (MPs) present in terrestrial environments show potential leaching risk to deeper soil layers and aquifer systems, which threaten health drinking water supply. However, little is known about the environmental fate of MPs natural sediments. To examine transport mechanisms sediments, column experiments were conducted using different sediments (10-150 µm) with conservative tracer. Particle breakthrough curves (BTCs) retention profiles (RPs) numerically interpreted HYDRUS-1D three models identify most plausible deposition mechanism MPs. Results that efficiency for a given particle size increased decreasing grain size, RPs exacerbated their hyper-exponential shape finer Furthermore, amounts effluent over 85% as decreased 10-20 µm both gravel coarse sand columns, while all larger (125-150 retained column. The modeling results suggested blocking becomes more important increasing sizes. In particular, attachment-detachment without was suited parameterization interpret movement small MPs, depth-dependent approach necessary adequately describe particles.

Язык: Английский

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Size- and concentration-dependent effects of microplastics on soil aggregate formation and properties

Journal of Hazardous Materials, Год журнала: 2023, Номер 465, С. 133395 - 133395

Опубликована: Дек. 28, 2023

Plastics fragment and threaten soil ecosystems. Degradation of structure is one the risks. Despite this, data on impacts different sized microplastics (MPs) aggregates lacking. This study systematically investigated effects pristine polyethylene powders sizes (<35, <125, <500 μm) concentrations (0, 0.1, 1.0, 10 wt%) aggregate formation their properties for two contrasting soils (woodland soil, WS; agricultural AS). 75 day wet-dry cycles produced newly-formed in all treatments. MP size concentration impacted incorporation MPs this varied with size; distribution also concentration. Aggregates containing wt% <35 μm had significantly lower MWDs (mean weight diameters) than controls. The wettability (>4 mm) reduced increasing exposure decreasing size. decreased water stability (1-2 WS but increased it AS. particle density concentration, whereas no effect. As breakdown, become smaller over time, potential risk to aggregated increases. Current concerns regarding tend focus toxicity largely ignore that can inhibit functioning. Our suggests serious degradation due contamination occur if are small relative present at high concentrations; coarser unlikely change even extreme loadings. degrade overtime, physical impact likely increase thus will increase.

Язык: Английский

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Occurrence characteristics and risk assessment of microplastics in agricultural soils in the loess hilly gully area of Yan' an, China

The Science of The Total Environment, Год журнала: 2023, Номер 912, С. 169627 - 169627

Опубликована: Дек. 27, 2023

Язык: Английский

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Micro- and nanoplastics in agricultural soils: Assessing impacts and navigating mitigation

The Science of The Total Environment, Год журнала: 2024, Номер 931, С. 172951 - 172951

Опубликована: Май 3, 2024

Micro-/nanoplastic contamination in agricultural soils raises concerns on agroecosystems and poses potential health risks. Some of have received significant amounts micro-/nanoplastics (MNPs) through plastic mulch film biosolid applications. However, a comprehensive understanding the MNP impacts plants remains elusive. The interaction between soil particles MNPs is an extremely complex issue due to different properties heterogeneity diverse characteristics MNPs. Moreover, are class relatively new anthropogenic pollutants that may negatively affect food. Herein, we presented review growth plants. We also discussed strategies for mitigating or eliminating contamination. perspectives future research highlighted.

Язык: Английский

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Evaluation of niche, diversity, and risks of microplastics in farmland soils of different rocky desertification areas

Journal of Hazardous Materials, Год журнала: 2024, Номер 466, С. 133603 - 133603

Опубликована: Янв. 24, 2024

Язык: Английский

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Microplastics in Sandy Soils: Alterations in Thermal Conductivity, Surface Albedo, and Temperature

Environmental Pollution, Год журнала: 2025, Номер 372, С. 125956 - 125956

Опубликована: Март 1, 2025

Язык: Английский

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Water retention and hydraulic properties of a natural soil subjected to microplastic contaminations and leachate exposures

The Science of The Total Environment, Год журнала: 2023, Номер 901, С. 166502 - 166502

Опубликована: Авг. 22, 2023

The influences of microplastics (MPs) contamination on soils have been extensively studied recently. Most previous studies focus saturated hydraulic conductivities and water retention loose under laboratory conditions. effects MPs the properties compacted for engineering purposes not well understood. This paper presents investigation capacity, (ksat) unsaturated (kθ) a natural soil contaminated by exposed to fresh, medium-aged, stabilized leachates. (kg) air (kgθ) are calculated. with maximum particle sizes 500, 150 50 μm were added obtain samples mass ratios 0.5, 1.0, 2.0, 5.0 %, respectively. Under similar ranges dry densities, permeation fresh leachates decreases ksat 30 % while exposure increases 10 due viscosities liquids. flow channel different concentrations vary. most complex can be found in 5 MPs. inclusions decrease residual moisture contents regardless MP percentages. air-entry pressures parameter n depend kθ combined tortuosity (l). Though l from -0.85 2.12 levels exposures, it does significant influence relative (kθ/ksat) (kgθ/kg) soils. Future long-term contamination.

Язык: Английский

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Impacts of conventional and biodegradable microplastics in maize-soil ecosystems: Above and below ground

Journal of Hazardous Materials, Год журнала: 2024, Номер 477, С. 135129 - 135129

Опубликована: Июль 8, 2024

Язык: Английский

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Effects of microplastics on the pore structure and connectivity with different soil textures: Based on CT scanning

Environmental Technology & Innovation, Год журнала: 2024, Номер 36, С. 103791 - 103791

Опубликована: Авг. 10, 2024

Soils contaminated with microplastics have disorganized pore structure, which reduces soil fertility. However, few studies focused on morphological characteristics and connectivity of pores under microplastic enrichment. This study evaluates how different concentrations polyvinyl chloride (0 %, 2 4 %) affect the structure (pore distribution porosity, characterization parameters, connectivity) soils textures (sandy, sandy loam, loamy). Computed tomography were used to reassemble images micropores following The network model, Euler number, tortuosity characterize complexity connected pores. results revealed that effects varied substantially depending texture, loam rapidly reducing or eliminating after introducing microplastics. loamy could still maintain a certain degree connectivity. Adding reduced porosity all three soils, showing most significant drop (89.51 at % concentration dramatically. overall impact is minimal. As abundance increased, model loam-connected became simpler. Under enrichment, soil's characteristic number grew by 91.17 In summary, even though differed due addition, deposition would severely disrupt reduce infiltration capacity regardless texture.

Язык: Английский

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Effect of microplastics on carbon, nitrogen and phosphorus cycle in farmland soil: A meta-analysis

Environmental Pollution, Год журнала: 2025, Номер unknown, С. 125871 - 125871

Опубликована: Фев. 1, 2025

Язык: Английский

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