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Environmental contamination by plastics and microplastics is a recognised problem worldwide, and it is the focus of many research teams. In the quantification of microplastics in the environment (plastic items with dimensions between 1 μm and 5 mm), the search for shared and universally recognised protocols and methodologies is still ongoing. In this study, the use of a method for extracting microplastics from marine sediments based on density separation has been considered. Fifty studies were analysed to investigate the scenario of salts exploited during microplastic extraction. The most commonly used salts are NaCl (45.6%), ZnCl2 (19.3%) and NaI (17.5%). Considerations related to cost, availability, hazards of the salts and thus the repeatability of the related extraction method are reported. In light of the findings, NaCl remains the most readily usable, economical and effective salt for the extraction of microplastics from marine sediments. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Laura Cutroneo, Anna Reboa, Irene Geneselli, Marco Capello. Considerations on salts used for density separation in the extraction of microplastics from sediments. Marine pollution bulletin. 2021 May;166:112216

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PMID: 33684703

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