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Microplastic Contamination in Rice Soils of Guyana: Abundance, Characteristics, and Environmental Implications
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Scientists found tiny plastic bits (microplastics) in soil from rice farms in Guyana, while nearby unfarmed land had little to none, suggesting that farming practices themselves may be introducing plastic pollution into the soil. Since rice is a staple food for millions of people, this raises questions about whether these plastics could end up in the crops we eat, though more research is needed to understand the actual health risks.
Microplastics are increasingly recognized as a global environmental concern due to their potential impacts on ecosystems and human health. While most research has focused on aquatic systems, microplastic contamination in agricultural soils remains poorly understood. This study investigates the occurrence of microplastics in rice-cultivated soils in Guyana, where rice is a dietary staple and an important economic crop. Triplicate soil samples were collected from eight fields across four cultivated and non-cultivated sites, then sieved, dried, and processed using digestion, density separation, and filtration. Microplastics were identified and characterized under a light microscope. Microplastics were detected in all rice-cultivated fields, with green fragments and pellets being the most abundant. In contrast, non-cultivated soils contained few or no microplastics. These results indicate that agricultural practices may contribute to microplastic accumulation in soils, with potential implications for soil health, crop productivity, and human exposure. The study highlights the need for further research into the sources, distribution, and long-term effects of microplastics in terrestrial agricultural environments.
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Study on the Prevalence and Characteristics of Microplastics in the Agricultural Soil of Rice Bowl of Puducherry – Bahour, India
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Researchers found an average of 63.13 microplastic particles per kilogram of agricultural soil in Puducherry, India, with fibers as the most abundant morphotype and Nylon identified as a major polymer, with concentrations slightly higher in pre-irrigation samples. This first characterization of microplastics in Puducherry's rice cultivation region highlights how agricultural practices, wastewater irrigation, and atmospheric deposition are contaminating food-producing soils across South Asia.
Abundance, Source Apportionment, and Surface Characteristics of Microplastics in Agricultural Soil in a Flood-Prone Area of Central Bangladesh
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Researchers found microplastics in every agricultural soil sample from flood-prone paddy, potato, and vegetable fields in Bangladesh, with polyethylene film fragments dominating and particle surfaces contaminated with toxic heavy metals including lead, cadmium, and arsenic. The co-occurrence of microplastics and adsorbed heavy metals in food-producing soils creates compounding risks for soil health, crop safety, and groundwater contamination.
Microplastics in Terrestrial Soils: Occurrence, Analysis, and Remediation
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Researchers reviewed how microplastics from synthetic polymers have spread throughout terrestrial soils globally, examining detection methods and emerging remediation strategies for a pollutant that now persists in farmlands and natural soils alike.
Microplastics in soil: a review on research status, sources, methods, and remediation strategies
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A comprehensive literature review found that soil microplastic research lags far behind aquatic studies despite annual MP discharge into farmland exceeding marine inputs, with synthetic textiles, tire wear, and urban dust as dominant sources entering soil via atmospheric deposition, sewage irrigation, and agricultural film use. The soil MP burden threatens food crop health, risks leaching into groundwater, and poses intergenerational health risks through nutrient disruption and potential plant-to-human transmission pathways.
Microplastics in Soils and Sediments: a Review of Characterization, Quantitation, and Ecological Risk Assessment
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Researchers reviewed current methods for detecting and measuring microplastics in soils and sediments, identifying a lack of standardized protocols as a key barrier to comparing findings across studies. The review calls for urgent development of consistent methodologies to better assess the true scale of microplastic pollution in land environments.
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