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Do microplastic residuals in municipal compost bioaccumulate in plant tissue?
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Compost made from municipal organic waste was found to contain microplastic residuals, and this study tested whether those plastics are absorbed by plants grown in the compost. Some plastic residuals were detected in plant tissues, suggesting that microplastics in compost could enter the food chain through agricultural use.
Conventional and biodegradable polymers present in residential and commercial organic waste have a propensity to fragment during the composting process. This research explores whether microplastic residuals present in industrially produced compost bioaccumulate in plant tissue grown in this medium. The experimental design was modeled on methodologies used in aquatic research of microplastics in bivalves to determine whether these marine research methodologies can be adapted for terrestrial applications. Of the 30 plant tissue samples grown in the industrially produced compost, the presence of suspected microplastics was observed in 57% of the samples through histological staining. Additional phytotoxicity testing and heavy metal analysis of the compost samples showed no evidence of ecotoxicity in the industrial compost. Further observation of the plant tissue and compost samples through infrared spectrometry needs to be conducted to identify the observed foreign bodies in the plant tissue as microplastics of non-organic polymer origin.
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Quantification and polymeric characterization of microplastics in composts and their accumulation in lettuce
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Researchers measured microplastics in eight types of compost and then grew lettuce in the contaminated material. Municipal solid waste compost contained the most microplastics, over 16,000 particles per kilogram, and lettuce grown in it accumulated the highest levels, with measurable impacts on plant growth. The findings suggest that compost quality standards should account for plastic contamination to protect food safety.
Integrated Impacts of Microplastics Contaminated Compost on Soil–Plant Systems and Bioaccumulation in Lettuce, Tomato, and Radish
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Researchers grew lettuce, tomatoes, and radish in soils amended with four composts of varying microplastic loads, finding that the most contaminated compost reduced early plant growth and resulted in bioaccumulation averaging 118, 81, and 140 microplastic particles per gram dry weight in the respective edible tissues. The study demonstrates that microplastics in compost-amended agricultural soil transfer directly into food crops, posing a direct pathway for human dietary exposure.
Microplastics identification and quantification in the composted Organic Fraction of Municipal Solid Waste
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Researchers quantified microplastics in composted organic municipal solid waste from five facilities, finding contamination levels that raise concerns about compost quality and the potential transfer of microplastics to agricultural soils through organic waste recycling.
Microplastics in compost from municipal solid waste. Assessment of their presence in the products generated with different industrial strategies.
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Microplastics were detected in compost made from municipal solid waste processed using different industrial strategies, raising concerns about the use of compost as a soil amendment. The presence of microplastics in compost could transfer plastic contamination directly to agricultural soils when compost is applied as fertilizer. The findings suggest that composting facilities need better plastic removal processes to prevent microplastic spread through the circular economy.
Plastic contamination of soil: is compost the source?
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Researchers assessed compost as a source of plastic contamination in agricultural soils, finding detectable levels of microplastics in commercial composts that are subsequently applied to farmland. This study identifies composting of plastic-contaminated organic waste as an underappreciated pathway for microplastic introduction into agroecosystems.
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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.