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

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 468, P. 133772 - 133772

Published: Feb. 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.

Language: Английский

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

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 465, P. 133395 - 133395

Published: Dec. 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.

Language: 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, Journal Year: 2023, Volume and Issue: 912, P. 169627 - 169627

Published: Dec. 27, 2023

Language: 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, Journal Year: 2024, Volume and Issue: 466, P. 133603 - 133603

Published: Jan. 24, 2024

Language: Английский

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

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 931, P. 172951 - 172951

Published: May 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.

Language: Английский

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

Environmental Pollution, Journal Year: 2025, Volume and Issue: unknown, P. 125871 - 125871

Published: Feb. 1, 2025

Language: Английский

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

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 477, P. 135129 - 135129

Published: July 8, 2024

Language: 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, Journal Year: 2023, Volume and Issue: 901, P. 166502 - 166502

Published: Aug. 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.

Language: Английский

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Effects of tire wear particles on the water retention of soils with different textures in the full moisture range

Journal of Contaminant Hydrology, Journal Year: 2024, Volume and Issue: 264, P. 104345 - 104345

Published: April 18, 2024

Tire wear particles (TWPs) are significant contributors to microplastic pollution in the environment, yet there is limited scientific information concerning their impact on soil hydraulic properties. This study aimed investigate of TWPs at different concentrations (1, 4, 8, and 16% air-dried mass packed samples, w/w) water retention curves (WRC) southern California soils with five textures (clay, clay loam, silt sandy loamy sand). The 8% were selected represent extreme scenarios that might occur near highway corridors. High-resolution data, spanning from saturation oven dryness, generated using HYPROP™ WP4C dew point meter instruments. We also developed WRC scaling equations based quantity TWPs. bulk density samples decreased as TWP concentration increased. inclusion very high (8% led a reduction moisture content intermediate dry ranges across various textures. However, same range, adding 1% had minimal reduction, while influence 4% treatment was noticeable only sand partially loam soils. Additionally, overall plant available increasing concentrations, except for soil. texture-specific models exhibited promising performance, RMSE values ranging 0.0061 0.0120 cm3 cm−3. When included an additional input predictor construct single model all textures, Nevertheless, it still indicated good fit 0.007 0.024 cm−3, highlighting suitability simple identifying TWPs-polluted soils, particularly practical purposes. findings this can contribute better understanding quantification hydrology.

Language: Английский

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Investigating the impact of microplastics on triphenyl phosphate adsorption in soil: Insights into environmental factors and soil properties

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 944, P. 173745 - 173745

Published: June 5, 2024

Microplastics (MPs) pose significant environmental pollution problems owing to their diverse properties such as various shapes, sizes, compositions, surface features, and levels of degradation. Moreover, interactions with toxic chemicals aging processes add complexity research. This study investigated the adsorption triphenyl phosphate (TPhP) in soil-only, MP-only, soil-MP simulated environments under different conditions. The experiment involved three phases: initial exposure a pH 5.5 fluorescent light, subsequent introduction ultraviolet (UV) radiation, adjustment 4.0 7.0, while maintaining UV exposure, each lasting 7 days. found that factors affected TPhP sorption capacity, higher observed radiation acidic In contrast, MP-only systems showed no clear trend for adsorption, suggesting kinetic limitations. When MPs were added soil, dynamics altered, varying capacities MP polymers ATR-FTIR spectroscopy, micro-Raman water contact angle measurements suggested potential photooxidation changes hydrophobicity subjected provides valuable insights into interplay between soil properties, characteristics, determining environments.

Language: Английский

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