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Separation and Measurement of Microplastics in Paddy Soil
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Researchers tested sodium iodide, zinc chloride, and deionized water for separating microplastics from paddy soil and found sodium iodide most effective, recovering particles ranging from 1 to 111 µm in size at abundances up to 5,800 pieces per kilogram of soil. Standardizing extraction methods like this is a prerequisite for generating reliable, comparable data on how widely microplastics have spread into agricultural soil and food crops.
Accumulation of microplastics (MPs) in soil is a worldwide concern, but a standardized analysis method for soil MPs has not been established yet. In this study, we compared deionized water, zinc chloride and sodium iodide solution with specific gravities of 1.0, 1.4 and 1.5, respectively, for the separation of MPs in paddy soil that had a history of coated fertilizer application. Organic matter in the paddy soils was digested with Fenton’s reagent (30% peroxide and 0.05 M iron sulfate) before density separation. Separation efficiency of MPs in soil was significantly high for sodium iodide, followed by zinc chloride, then water. The abundance of MPs in the soil ranged 100 - 5800 pieces/kg. The particle sizes of MPs in the soil were found to be extremely small, ranging from 1 - 111 μm. Since paddy fields are waterlogged during plantation and are drained about two weeks before harvest, large MPs might be flushed out by water. It can be concluded that MPs in paddy soil may have large range of plastic materials with different gravity and small particle size.
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Researchers developed an efficient, cost-effective, and environmentally friendly protocol for extracting microplastics from soil samples, addressing the lack of standardized methods and evaluating extraction performance across different soil matrices.
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Researchers reviewed 120 studies on plastic contamination in agricultural soils worldwide, finding that mulching films, sewage sludge, and compost are the primary sources of microplastics in farmland, with Asia accounting for 60% of reported studies. The review recommends using dense salt solutions like ZnCl or NaI to extract heavy microplastics from soil and calls for more standardized methods to better compare results across studies.
Method Validation: Extraction of Microplastics from Organic Fertilisers
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This paper validates a standardized laboratory method for extracting microplastics from organic fertilizers such as compost, sewage sludge, and manure — materials that are widely applied to agricultural fields and are known to introduce microplastics into soils. The validated protocol uses hydrogen peroxide digestion followed by sodium iodide density separation, achieving recovery rates above 95% for particles larger than 315 micrometers. However, a secondary analysis suggested recovery rates drop significantly for particles smaller than 250 micrometers, highlighting a limitation. Standardized extraction methods are critical for generating comparable data on how much microplastic contamination is entering farmland through organic amendments.
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