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Soil Microplastic Extraction Efficiency Depends on the Sample Incubation Time and the Organic Matter Removal Agent Used
Summary
Laboratory experiments compared microplastic extraction efficiency across soils with different organic matter contents using H2O2 and KOH digestion agents, finding that longer incubation times significantly reduced recovery rates in high-organic-matter soils. Standardizing extraction protocols is essential for accurate environmental monitoring of microplastics, since inconsistent methods can cause researchers to underestimate true contamination levels in agricultural and natural soils.
Environmental pollution by microplastics is now a global problem, as global plastic production is increasing and at the same time recycling of plastic waste is low. In recent years, a number of methods have been developed to determine the content of microplastics in soil. This study compares the efficiency of microplastic extraction in two-week and three-month incubation samples from three different soils artificially contaminated with different types of microplastics. H2O2 and KOH were used as agents to remove organic matter. The effects of changing the incubation time were significant in soils with a high organic matter content. A longer incubation time resulted in a lower efficiency of microplastic extraction. Compared to the results obtained with the control method after a two-week incubation, the loose sand samples achieved a similar extraction efficiency (86%), the amount of MP recovered in the uncontaminated sandy clay samples was 75%, while the sandy clay soils contaminated with heavy metals was 44%. The samples without organic matter removal showed a significantly better recovery rate of microplastics than the samples treated with H2O2 and KOH.