原子間力顕微鏡と透過型電子顕微鏡を用いた天然水中のコロイド分析 : 山形・新潟県境金丸地区の例

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The grain size and chemical composition of colloids in stream water and groundwater collected from Kanamaru region, a boundary between Yamagata and Niigata Prefectures, Japan, were investigated by means of a filtration method, atomic force microscopy (AFM) and analytical electron microscopy (AEM). The filtration method demonstrated that the stream water included the colloids ranging from 0.0063 to 0.22 μm, whereas that the groundwater (10 m depth) included the colloids ranging from 0.025 to 0.22 μm. The AFM provided more detail information on grain size distribution of colloids (0.001 μm of resolution) compared with the filtration method; i.e., the colloids ranging from 0.025 to 0.035 μm were predominant in the stream water whereas those from 0.020 to 0.040 μm occupied a half of the total colloids in the groundwater. The AEM analysis showed that compositions of the colloids were different between the stream water and groundwater. Such a difference may influence on adsorption properties of radionuclides to colloids.
2009-03-30