Estimation of Temporal Variations and Annual Flux of Microplastics in Rivers Under Low- and High-flow Conditions

Summary

This study conducts field observations on microplastic concentrations in a large river (Edo River) and a smaller river (Oborogawa, Chiba) under both low- and high-flow conditions, finding seasonal variation and estimating the Edo River's annual microplastic flux at approximately 15 billion particles (2.42 tons), with flood events contributing 73.5% of that total.