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Microplastics elutriation from sandy sediments: A granulometric approach
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This study optimized elutriation — a water-flow technique for separating particles by size — to more efficiently extract microplastics from sandy sediments while minimizing carry-over of sand. The granulometric (particle-size-based) approach improved extraction yields and provides a practical low-cost tool for environmental microplastic monitoring.
Although relatively easy to extract in the marine environment, microplastics are very difficult to recover when they are trapped in sediments. The elutriation column is one of the best tools currently available for extracting plastics from sediment, but with a high sand recovery yield. This study aims to address the following questions: (i) is it possible to use a sedimentological approach to limit the sand recovery? (ii) does the extraction velocity of the sand and plastic particles vary according to density and granulometry? (iii) what is the relative recovery efficiency obtained for dense polymer particles mixed with marine sand? Based on a new granulometric classification, different plastic particle-size fractions are defined. Their extraction velocities are experimentally determined on particles of sediment and different plastics (PA, PVC). The particle recovery experiments indicate that it is possible to extract >90% of dense plastic particles in cases of negligible sand recovery.
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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.