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A Perspective on Plastics and Microplastics Contamination in Garden Soil in British Columbia, Canada
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A perspective paper argues that current Canadian compost regulations — which allow up to 1% plastic by dry weight — are inadequate because low-density microplastics can represent a large number of particles even at this threshold, and commercial compost is a significant pathway for introducing microplastic contamination into garden soils. The authors call for stricter regulations and better monitoring of plastic content in commercially sold compost in British Columbia and across Canada.
Plastic contamination is commonly reported in urban and rural soils, as well as in fresh and ocean waters. Canada’s government has attempted to limit the contamination of single-use plastic by banning the manufacturing and selling of specific types of plastic. In British Columbia, current regulations governing commercial composting state that when compost has less than 1% of its dry weight representing foreign materials (including plastic), it can be sold and used in soils. However, due to the low density of plastic and its potential to break down into microparticles, this amount may be enough to become toxic when used in agricultural soils. This paper studies contamination of plastic in garden soils and summarizes how this can affect the environment with a preliminary examination of a garden soil sample. The examination showed that the garden soil sample contained mainly low-density polyethylene, polyethylene and polypropylene plastics (identified through ATR-FTIR) in oxidized and unoxidized forms that can come from commercial composting and hypothesizes that this plastic could break down into microplastic particles. In order to limit the amount of plastic contamination in agricultural soils, it is necessary to modify current compost regulations in order to treat plastic differently than other foreign materials (glass, metal, wood).
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Microplastic pollution in long-term urban compost amended soils
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This study examined microplastic pollution in soils that had received long-term amendments of urban compost, finding significant plastic contamination from compost application. The results highlight that composting can be a pathway for microplastics to enter agricultural soils.
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.
Determination and quantification of microplastics in compost
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Researchers analyzed commercially available compost products to determine how much microplastic contamination they contain. They found microplastics in all tested composts, with fibers and fragments being the most common forms, primarily made of polyethylene and polypropylene. The findings raise concerns that applying commercial compost to agricultural land may be an overlooked pathway for introducing microplastics into soil.
Microplastic Abundance in the Locally Produced Commercial Compost and the Characteristics
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Researchers measured microplastic abundance in locally produced commercial compost, characterizing particle morphology, size, and polymer type. The compost contained measurable microplastic concentrations dominated by polyester fibres and polyethylene fragments, confirming that commercial composting does not eliminate microplastic contamination and may serve as a route for soil plastic input.
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.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.