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Depth Distribution of Microplastics Contamination and Associated Risks in Homestead Farming Soils from Industrial and Non-Industrial Regions of Bangladesh
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Researchers found tiny plastic bits (microplastics) in backyard farm soils across Bangladesh, with the highest levels near industrial areas and closer to the surface — though some plastic had worked its way deeper into the soil over time. The good news: current health risk estimates from breathing in, touching, or accidentally swallowing these particles fall below dangerous thresholds, so there's no immediate cause for alarm. Still, since plastics don't break down easily and can build up in soil over years, the researchers say better waste management and ongoing monitoring are important to prevent bigger problems down the road — especially since kids showed higher expos
Microplastic (MP) contamination in terrestrial ecosystems has emerged as a critical environmental concern, particularly in agricultural soils influenced by anthropogenic activities. This study investigated the depth-wise distribution, polymer composition, and associated ecological and human health risks of MPs in homestead agricultural soils across four regions of Bangladesh representing different levels of industrialization: Narayanganj (old industrial), Savar (moderate industrial), Gazipur (emerging industrial), and Mymensingh (non-industrial). Soil samples were collected from two depth intervals (0–20 cm and 21–50 cm), and MPs were extracted using density separation, identified through microscopic analysis, and characterized via ATR-FTIR spectroscopy. A diverse range of MP morphologies and polymers was detected, with irregular particles and fragments dominating the composition. Polypropylene (PP), high-density polyethylene (HDPE), and polyethylene terephthalate (PET) were the most abundant polymers, reflecting widespread domestic, industrial, and agricultural plastic usage. MP abundance was consistently higher in surface soils, indicating dominant surface inputs, although vertical migration into subsoil layers was evident. Spatial analysis revealed higher MP contamination in industrial regions, particularly Narayanganj and Savar, compared to the non-industrial reference site. Ecological risk assessment indicated low risk levels across all regions; however, significant spatial variability was observed. Human exposure assessment demonstrated that inhalation was the primary pathway, followed by dermal contact and ingestion, with children exhibiting higher exposure levels than adults. Lifetime average daily dose (LADD) and carcinogenic risk estimates remained below acceptable thresholds, suggesting minimal immediate health risks. Nevertheless, the persistence, mobility, and cumulative nature of MPs highlight potential long-term concerns. Therefore, this study provides comprehensive insights into the sources, distribution, and risks of MPs in homestead agricultural soils and underscores the need for improved waste management practices, sustainable agricultural strategies, and long-term monitoring to mitigate environmental and human health impacts.
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Microplastic Contamination of Non-Mulched Agricultural Soils in Bangladesh: Detection, Characterization, Source Apportionment and Probabilistic Health Risk Assessment
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Researchers found microplastics in agricultural soil across Bangladesh at all depths tested, even though the fields did not use plastic mulch film. Eight different plastic types were identified, with concentrations varying by location, and coastal areas had the highest levels. The study suggests that irrigation water and organic fertilizers are introducing microplastics to farmland, potentially entering the food chain through crops grown in contaminated soil.
Risk assessment of microplastic pollution in an industrial region of Bangladesh
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Scientists assessed microplastic pollution in industrial soil from Narayanganj, Bangladesh, finding contamination in all 12 samples tested, with fibers being the most common particle type. A pollution risk assessment classified the area as having a moderate to high level of microplastic contamination. This study highlights how industrial regions in developing countries face significant microplastic soil pollution that could affect nearby communities through dust, water, and locally grown food.
Vertical profile of low-density microplastics in vegetable cultivation soils in Nuwara Eliya, Sri Lanka
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Researchers found tiny plastic particles throughout vegetable-growing soil in Sri Lanka, with more contamination near urban areas and smaller plastic bits gradually sinking deeper into the ground over time. This matters because these vegetables are grown for food, and as microplastics migrate downward, they could eventually reach groundwater supplies too, raising concerns about plastic exposure through both the food we eat and the water we drink.
Soil Microplastic Pollution Across Terrestrial Ecosystems: A Review of Sources, Distribution Patterns, Polymer Types and Environmental Implications
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Tiny plastic bits from things like farm mulch, car tires, and trash are building up in soil everywhere—farms, cities, and even forests—and the smallest pieces can sink deep into the ground where they're more likely to be taken up by plants and soil organisms. This matters for us because these plastics can enter the food we grow, and this review (a summary of many existing studies) shows scientists still don't fully understand the long-term health and environmental risks, meaning better plastic recycling and management are urgently needed.
Microplastics in agricultural soils: Evidence from an industrial suburb of Bangladesh
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Researchers sampled agricultural soils from the surface and subsurface layers at an industrial suburb of Bangladesh, finding microplastic abundances of 1,309 items/kg in surface soils with significant correlations to soil pH, electrical conductivity, and organic matter content.
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