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Author response for "Vertical transport of polystyrene nanoplastics in natural soils under unsaturated conditions: Influence of particle size and texture"
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Vertical transport of polystyrene nanoplastics in natural soils under unsaturated conditions: influence of particle size and texture
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Laboratory experiments showed that polystyrene nanoplastics can travel downward through unsaturated soils, but larger particles and clay-rich soils retain them more effectively than smaller particles in sandy soils. Understanding how nanoplastics move through soil is important for predicting whether they will reach groundwater and contaminate drinking water sources.
Effects of Soil Components on Microplastics Transport and Retention in Natural Soils: Various Microplastics Types and Sizes
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Column transport experiments across desert, red, and black soils showed that microplastic mobility decreases with increasing particle size and that metal oxide-rich red soils nearly completely retained MPs, while natural organic matter in black soils created non-monotonic transport patterns. Understanding how soil composition governs microplastic movement is essential for predicting where MPs accumulate in agricultural soils and groundwater systems used for food production and drinking water.
Transport of polystyrene nanoplastics in natural soils: Effect of soil properties, ionic strength and cation type
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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.
Aggregation of positively charged polystyrene nanoplastics in soil–root systems
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Researchers showed that positively charged polystyrene nanoplastics aggregate in the presence of plant root exudates and soil leachate while negatively charged nanoplastics remain stable and mobile, driven by organic acid adsorption onto nanoparticle surfaces. Understanding nanoplastic charge-dependent behavior in soil-root systems is crucial for assessing how nanoplastics are taken up by crops and may enter the human food supply.
A Review of Microplastics in Soil: Distribution Within Pedosphere Compartments, Environmental Fate, and Effects
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This review synthesizes research on microplastic distribution in soils across different land-use types, finding that land use, particle size, soil chemistry, and biological activity all govern microplastic migration, and that MPs disrupt soil aggregate stability, microbial communities, and carbon/nitrogen cycling. The findings highlight agricultural and urban soils as critical hotspots for MP accumulation that threatens sustainable food production and ecosystem functioning.
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