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Investigating Microplastic Particle Transport in Soils using Micro-CT Senior Project
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Researchers investigated microplastic particle transport in soil environments using micro-CT imaging, with a focus on the physical changes microplastics induce in soil structure and chemistry as a baseline for understanding interactions with mycorrhizal fungi and plant roots. The study sought to characterise how microplastic addition alters soil porosity and geological chemistry, establishing a foundation for further experiments on microplastic-fungi-plant relationships.
The motivation for my project was a deep curiosity on the symbiotic relationship between mycorrhizal fungi and plant roots, specifically how that relationship might interact with microplastics that seep into soil environments. This felt like a very important and relevant thing to investigate because plastic is a huge part of our daily lives and in turn, microplastics are a huge part of our natural environment. The danger of microplastics is that they are invisible to the naked eye, so we are unable to easily see the direct effects they have on the soil and the microorganisms and plants living within the soil. Not only do microplastics directly impact the living aspects of a soil environment, but they also affect the geological chemistry of the soil; this sort of pathway and the physical changes that could be observed from microplastic addition to the soil is what I first looked at so that I could get a baseline for any further experimentation. The idea was to eventually see how mycorrhizal fungi interacted with microplastic;
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This study used computed tomography and 3D visualization to analyze how microplastics alter pore structure and connectivity in sandy, sandy loam, and loam soils. Microplastic contamination disrupted soil pore architecture, which can affect water movement, root growth, and the ability of soil microbes to break down organic matter — all critical for agricultural productivity.
Effects of microplastics on the pore structure and connectivity with different soil textures: Based on CT scanning
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Using CT scanning, researchers found that microplastics significantly disrupt soil pore structure, with sandy soils losing up to 89% of their porosity at higher contamination levels. While not directly about human health, degraded soil structure can reduce agricultural productivity and alter how water and contaminants move through soil toward food crops and groundwater.
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Researchers used micro-CT imaging to visualize three-dimensional transport pathways of microplastics through gravel and sand sediments relevant to riverbank filtration, finding that smaller sediment pore sizes restrict microplastic mobility and that particle properties such as shape, size, and polymer density influence infiltration depth.
Microplastic retention in soils: Pore-scale mechanisms revealed by high-resolution micro-computed tomography and digital rock physics
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Scientists used detailed 3D scanning to watch how tiny microplastic particles get trapped in soil as water flows through it, something that's hard to observe otherwise. They found that surprisingly, fast-flowing water doesn't always flush microplastics out better, instead, it can cause them to clump together and clog small spaces in the soil, which reduces how well water moves through it. This matters because soil clogged with microplastics could affect groundwater filtration and how pollutants (including the microplastics themselves) travel toward the water we eventually drink.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.