The automatic ultrafiltration device(AUD) can be fractionated largely quantity of environmental nanoparticles(<100 nm),especially soil *** on the physicochemical properties and mineral species a of lateritic soils ...
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The automatic ultrafiltration device(AUD) can be fractionated largely quantity of environmental nanoparticles(<100 nm),especially soil *** on the physicochemical properties and mineral species a of lateritic soils and gravel soil layers in paleoenvironmental soil profile is severely *** soil profile of the Taoyuan terrace was employed to demonstrate its different extents of lateritic *** objectives of this study were to compare the physicochemical properties of lateritic soils and gravel soil layers and identify using conventional and synchrotron X-ray diffraction (XRD) analyses mineral species in nanoparticles separated by AUD *** samples were collected from paleoenvironmental lateritic *** samples were examined using elemental analysis,conventional and synchrotron XRD analyses,high gradient magnetic separation,separation and collection of nanoparticles by AUD apparatus,and transmission electron microscopy(TEM).The soil pH,redness index, quantities of free Al and Fe-oxides(Ald and Fed),and clay content of lateritic soils are higher than those of gravel soil ***,kaolinite,gibbsite,quartz,goethite,and hematite were identified in clay fractions and nanoparticles by conventional and synchrotron XRD *** images show presence of hematite nanoparticles on the surf ace coating of kaolinite nanoparticles and aggregated hematite nanoparticles overlapping the edge of a kaolinite flake in a size range of 4～7 *** XRD techniques are more straightforward and powerful than conventional XRD with random powder methods f or identifying nanoparticles in red soils,particularly for illite,kaolinite,goethite,and hematite *** to chemical compositions of clay fractions and red soil features in the Taoyuan terrace,these red soils can be taken as lateritic red earths or red *** work suggests that physicochemical properties and mineral species of red soil at all depths can shed light
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