This study made it clear that road dust plays an important role for Cs-137 dynamics emitted by the Fukushima Daiichi nuclear power plant accident. It was proved from the Cs-137 and heavy metals determination in road dust, drainage gutter sediment beside pavement, and riverbed sediment around the inflow point of the gutter. Road dust and drainage gutter sediment contained significantly higher concentrations of Cs-137 and Cr, Ni, Cu, Zn, Mo, Cd, Sn, Sb, and Pb than riverbed sediment. These heavy metals are typically enriched in road dust in general and originate in anthropogenic sources. Concentrations of Cs-137 and the heavy metals were higher in riverbed sediments at the inflow point of drainage than in non-inflow points. Drainage gutter sediments exhibited Cs-137 and heavy metal accumulation at the downmost of the gutter, which is the inflow point into the river. Accordingly, distribution of Cs-137 and the heavy metals concentrations were consistent with each other. Moreover, the concentrations of Cs-137 and heavy metals were correlated positively and significantly, with different proportions between sampling sites but similar between sample type and survey date. This indicates that the discharge of Cs-137 and heavy metals is characteristic of the features of the locations, such as Cs-137 and heavy metals concentrations, (micro-) topography, structure of the road and gutter, pavement area, traffic density, and so on. We conclude that road dust is a major medium of Cs-137 transport from land into aquatic ecosystems.

中文翻译：

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道路扬尘是从陆地到河流的重要放射性铯转运体。

这项研究清楚表明，道路尘土对于福岛第一核电站事故所散发的Cs-137动力学起着重要作用。从Cs-137和重金属的测定可以证明道路尘埃，人行道旁的排水沟沉积物以及排水沟流入点附近的河床沉积物。道路扬尘和排水沟沉积物中的Cs-137和Cr，Ni，Cu，Zn，Mo，Cd，Sn，Sb和Pb的浓度明显高于河床沉积物。通常，这些重金属通常富含道路尘埃，并源自人为来源。在排水入水点，河床沉积物中Cs-137和重金属的浓度高于非入水点。排水沟的沉积物在排水沟的最下部显示出Cs-137和重金属积累，这是流入河流的入口。因此，Cs-137的分布与重金属的浓度一致。此外，Cs-137和重金属的浓度呈正相关且显着相关，采样点之间的比例不同，而样品类型和调查日期之间的比例相似。这表明Cs-137和重金属的排放是该位置特征的特征，例如Cs-137和重金属的浓度，（微）地形，道路和排水沟的结构，人行道面积，交通密度，等等。我们得出的结论是，道路扬尘是Cs-137从土地到水生生态系统运输的主要媒介。Cs-137和重金属的浓度呈正相关，且呈显着正相关，采样点之间的比例不同，而样品类型和调查日期之间的比例相似。这表明Cs-137和重金属的排放是该位置特征的特征，例如Cs-137和重金属的浓度，（微）地形，道路和排水沟的结构，人行道面积，交通密度，等等。我们得出的结论是，道路扬尘是Cs-137从土地到水生生态系统运输的主要媒介。Cs-137与重金属的浓度呈正相关，且呈显着正相关，采样点之间的比例不同，而样品类型和调查日期之间的比例相似。这表明Cs-137和重金属的排放是该位置特征的特征，例如Cs-137和重金属的浓度，（微）地形，道路和排水沟的结构，人行道面积，交通密度，等等。我们得出的结论是，道路扬尘是Cs-137从土地到水生生态系统运输的主要媒介。例如Cs-137和重金属的浓度，（微）地形，道路和排水沟的结构，人行道面积，交通密度等。我们得出的结论是，道路扬尘是Cs-137从土地到水生生态系统运输的主要媒介。例如Cs-137和重金属的浓度，（微）地形，道路和排水沟的结构，人行道面积，交通密度等。我们得出的结论是，道路扬尘是Cs-137从土地到水生生态系统运输的主要媒介。