11:00 〜 13:00
[ACC28-P02] Long-range transport and origin of microplastics in rime-ice observed at a remoto mountain
キーワード：樹氷、マイクロプラスチック、長距離輸送、自由対流圏
In these days, the pollution of marine, freshwater and terrestrial environment with microplastics (MPs) has been focused on. However, only a few researches have reported which focused on long-range transport of atmospheric MPs. In this study, we use rime-ice to clarify the long-range transport of atmospheric MPs in free troposphere altitude of mountain site.
Atmospheric MPs were identified by Fourier transform infrared imaging in all samples. The MPs concentrations of rime-ice was ranged from 5.5 to 12.1 ×103 N liter-1. About 90% of MPs observed in rime-ice is <100µm and mainly polyethylene (PE). Most of them are fragment. The size of atmospheric MPs are relatively small and has the density of polymer are between 0.65 to 1.8 g/cm3 which is smaller than the soil particle (2.65 g/cm3). Gathering of the sampling site where was free troposphere, and back trajectory analysis, the MPs in rime-ice are move to 1,000 km far away.
Atmospheric MPs were identified by Fourier transform infrared imaging in all samples. The MPs concentrations of rime-ice was ranged from 5.5 to 12.1 ×103 N liter-1. About 90% of MPs observed in rime-ice is <100µm and mainly polyethylene (PE). Most of them are fragment. The size of atmospheric MPs are relatively small and has the density of polymer are between 0.65 to 1.8 g/cm3 which is smaller than the soil particle (2.65 g/cm3). Gathering of the sampling site where was free troposphere, and back trajectory analysis, the MPs in rime-ice are move to 1,000 km far away.