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Occurrence and identification of microplastics along a beach in the Biosphere Reserve of Lanzarote
Summary
Researchers documented microplastic accumulation on a remote beach in the Chinijo Archipelago of the Canary Islands, finding an average density of 36.3 grams per square meter with particles preferentially depositing in rock-sheltered areas, composed largely of polypropylene and polyethylene fragments.
This work studied the accumulation of plastic debris in a remote beach located in La Graciosa island (Chinijo archipelago, Canary Islands). Microplastics were sampled in the 1-5 mm mesh opening range. An average plastic density of 36.3 g/m was obtained with a large variability along the 90 m of the beach (from 8.5 g/m to 103.4 g/m). Microplastic particles preferentially accumulated in the part of the beach protected by rocks. A total number of 9149 plastic particles were collected, recorded and measured, 87% of which corresponded to fragments. Clear colours and microscopic evidence of weathering corresponded to aged plastics wind-driven by the surface Canary Current. The chemical composition of plastics particles corresponded to PE (63%), PP (32%) and PS (3%). Higher PE/PP ratios were recorded in the more protected parts of the beach, suggesting preferential accumulation of more aged fragments.