X射线微断层扫描技术(XDMT)在多孔介质中含砷聚集物的三维成像应用

利用X射线微断层差异扫描技术,扫描富砷河床沉积物及人工含砷样品,对多孔介质中的含砷聚集物进行成像分析.利用Avizo 6和Blob3D等工具对获取的数据进行处理,从而实现了含砷聚集物的三维可视化成像.结果显示,大量的含砷聚集物沉积在多孔介质颗粒表面,且不同尺寸的聚集物呈现出明显的形态多样化特征.小颗粒聚集物趋向于球形,大颗粒聚集物则趋向于扁平状.研究表明,该技术可在不破坏样品的前提下,直接观测多孔介质因沉积作用导致其内部结构的变化.

Application of XDMT in three-dimensional visualization of arsenic aggregates in porous media

This paper applied the X-ray difference micro-tomography to characterize the distribution of arsenic aggregates within porous media by scanning a series of laboratory prepared arsenic samples and arsenic-rich fluvial sediments from a river.Tools like Avizo 6 and Blob3D were used to process the tomographic data and visualize the 3D distribution of arsenic aggregates in the media.3D visualization showed that arsenic accumulated in the pore space and grain surface of the media.Arsenic aggregates of different sizes had distinctly different morphologies: small aggregates tended to be spherical while big aggregates were relatively flat.These results show that difference micro-tomography can be used to observe the variation of internal structure caused by deposition,without destructions to the porous media.