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Microplastics: Are they really a threat to groundwater systems?
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This review assesses whether microplastics pose a genuine threat to groundwater systems, concluding that while evidence of microplastic presence in groundwater is growing, transport mechanisms and ecological risks remain poorly characterized. Researchers call for standardized methods and long-term monitoring to better evaluate the scale of the problem.
Recently, global annual plastics production has reached a record of 359 million tonnes and in Europe nearly 62 million tonnes, with only a small portion (6-26%) being recycled. Plastic debris released into the environment are categorized, according to size, as macroplastics (> 5mm), microplastics (0.1μm - 5mm) and nanoplastics (< 0.1μm). Microplastics are now recognized as an emerging pollutant due to their abundance in natural environments, and because of growing concerns, the United Nations Environment Programme (UNEP) has included it in the list of top 10 environmental problems.Additionally, microplastics have a tendency to act as a vector for other contaminants such as pathogens, organic pollutants and heavy metals due to strong dispersion and diffusion mechanisms. The majority of ongoing research on microplastics has primarily focussed on marine systems, but land surface contamination may also be important due to observed release rates that are approximately 20 times higher, in comparison to oceans. Nevertheless, only a few studies have addressed the presence of microplastics in soil and groundwater.A research gap exists regarding the physical and chemical mechanisms that govern microplastic transport and retention in groundwater. Therefore, a study is being conducted to investigate the distribution, fate and transport of microplastics through groundwater. The overall aim is to improve the understanding of the transport mechanisms of these emerging pollutants and if they enhance the mobility of microbial communities. This research has two main objectives: firstly, to simulate the transport behaviour of various kinds of microplastics (different types, shapes, sizes, and surface morphology), secondly, to analyse the microplastics as potential vectors for microorganisms.The key factors that are affecting the transport of different sized microplastics will be addressed. Additionally, the co-transport of microorganisms with microplastics during their movement within soil and groundwater will also be considered.
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Global status, risk assessment, and knowledge gaps of microplastics in groundwater: A bibliometric analysis
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This review analyzed 215 published studies on microplastics in groundwater and found that this area of research is still in its early stages compared to surface water studies. Evidence indicates that microplastic contamination is present in groundwater worldwide, but sampling methods and reported results vary widely. The authors identified significant knowledge gaps in understanding how microplastics move through underground water systems and what risks they may pose to drinking water sources.
Groundwater in the age of plastic
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This review examines microplastic contamination of groundwater globally, synthesizing studies on occurrence, transport pathways through soil and aquifer matrices, and the emerging implications for drinking water safety and groundwater ecosystem health.
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This review examines the emerging issue of microplastic and nanoplastic contamination in groundwater systems, covering their sources, distribution patterns, potential environmental risks, and removal strategies. Researchers highlight that the strong heterogeneity and complexity of underground environments make studying microplastic migration particularly challenging. The study identifies significant knowledge gaps in sampling methods and calls for more research into how microplastics move through groundwater aquifers.
Microplastic characteristics, transport, risks, and remediation in groundwater: a review
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Researchers reviewed microplastic contamination in groundwater, finding concentrations up to 6,832 particles per liter from sources including landfills, agriculture, and atmospheric deposition, and reporting that membrane filtration technologies such as reverse osmosis can achieve 93–99% microplastic removal.
Microplastics in Groundwater: Pathways, Occurrence, and Monitoring Challenges
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This review provides a comprehensive look at how microplastics make their way into groundwater from surface water, seawater, and soil, and examines the challenges researchers face in detecting and monitoring them. The study found that a lack of standardized sampling and analysis methods makes it difficult to compare findings across different studies. Researchers emphasize the importance of understanding local geological conditions and preventing sample contamination to improve the reliability of groundwater microplastic monitoring.
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