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Elucidation of the Actual State of Existence of Tire-derived Microplastics at Intersections
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Researchers sampled road dust at straight road sections and intersections in two areas of Japan and used FTIR to identify tire-derived microplastics, finding higher MP counts in high-traffic areas and at intersection points where multi-directional vehicle movement and turning occur.
近年，粒径5mm以下のプラスチック粒子と定義されているマイクロプラスチック（以下，MPsとする）による水環境の汚染が報告されている．中でもタイヤ由来のMPsは一次MPs発生の28％を占めていることからタイヤ由来のMPsの発生状況を把握することは海洋流出抑制に寄与すると考えられる．本研究では，多摩市乞田と亀戸で道路粉塵のサンプリングを行い，FTIRを用いてタイヤ粉塵由来のMPsの同定を行った．乞田は直線2ヶ所，亀戸では交差点内4 か所とその手前の直線2か所でサンプリングを実施した．結果，両地点の直線で得られたMPsの比較をすると交通量の多い乞田の方が多くなった．また，交差点内の複数車線が交わる地点のMPs数はその他の地点に比べ2倍以上多くなったため，様々な方向から車両が通る地点やカーブが発生する地点でMPs数が増加する可能性が示唆された．
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Road dust samples collected near traffic lights contained tire wear particles (TWPs), with the concentration and size distribution varying by location and traffic direction. Tire wear is one of the largest sources of microplastic pollution in urban environments, and these particles are carried into waterways by stormwater runoff.
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