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Representation of investigation results of microplastics on sandy beaches—accumulation rate and abundance in the entire study site
Summary
A long-term study at beaches in Nagasaki Prefecture, Japan measured microplastic accumulation rates and developed a weighting method to estimate total microplastic content across entire beach areas, enabling standardized comparison between sites. Microplastic content varied widely between beaches (from ~298 to ~4,084 mg per square meter of sand), underscoring the need for consistent methodology when tracking pollution trends.
Long-term microplastics (MPs) environmental pollution trends cannot be understood only by investigating their presence on beaches. Without estimating MPs for the entire beach, comparisons between multiple beaches cannot be made. In this study, Nagasaki Prefecture was selected as the study site, we measured MPs accumulation rate to express the MPs pollution trend and weighted the measurement results to enable comparison of MPs content among multiple sandy beaches. The MPs accumulation rate in the study site was measured by periodic investigation at fixed spots. The average in the supratidal zone was 1.5 ± 0.9 mg-MPs/(m2-sand⋅ d) (n = 15). The weighting of the MPs content in hot spots and non-hot spots by their respective areas enabled us to obtain the representative value and the dispersion of the MPs content in the entire study site. The MPs contents in the three beaches were 298 ± 144, 1,115 ± 518, and 4,084 ± 2,243 mg-MPs/(m2-sand), respectively. Using these values, it is possible to compare the MPs contents of multiple beaches.