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Microplastics in soils: a review of possible sources, analytical methods and ecological impacts
Summary
This review of over 60 studies examines the sources, global distribution, and analytical methods for microplastics in soil, finding that agricultural soils are particularly contaminated via sewage sludge application, plastic mulch, and atmospheric deposition. The authors call for standardized extraction and identification protocols to enable cross-study comparisons.
Abstract Microplastics are emerging persistent pollutants that have been extensively detected in aqueous environments. Yet, scientists have little knowledge of microplastic pollution in soils. This study reviewed over 60 articles, with the following objectives: (i) to discuss sources and the global distribution of microplastics in soils; (ii) to evaluate current extraction techniques and analytical methods for microplastics in soils; and (iii) to comprehensively assess their adverse impacts on soils and soil organisms. Moreover, this review highlights the lack of research into microplastic contamination in soils as a significant knowledge gap. Research into the fate, sources and analytical techniques of soil microplastics and the interactions between soil organisms, soils and microplastics is essential in order to underpin management decisions aimed at safeguarding the ecological integrity of our soils. © 2020 Society of Chemical Industry