土壤纳精米颗粒的自动超滤法分级及其传统和同步加速X射线分析

摘要：

The automatic ultrafilitration device (AUD) can be fractionated largely quantity ofenvironmental nanoparticles (<100 nm),especially soil samples.Information on the physicochemicalproperties and mineral species a of lateritic sails and gravel soil layers in paleoenvironmental soil profile isseverely lacking.Red soil profile of the Taoyuan terrace was employed to demonstrate its different extentsof lateritic weathering.The objectives of this study were to compare the physicochemical properties oflateritic soils and gravel soil layers and identify using conventional and synchrotron X-ray diffraction(XRD) analyses mineral species in nanoparticles separated by AUD apparatus.Soil samples were collectedfrom paleoenvironmental lateritic soils.Soil samples were examined using elemental analysis,conventionaland synchrotron XRD analyses,high gradient magnetic separation,separation and collection ofnanoparticles 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 ofgravel soil layers.Illite,kaolinite,gibbsite,quartz,goethite, and hematite were identified in clay fractionsand nanoparticles饰conventional and synchrotron XRD analyses.TEM images show presence of hematitenanoparticles on the surf ace coating of kaolinite nanoparticles and aggregated hematite nanoparticlesoverlapping the edge of a kaolinite flake in a size range of 4-7 nm.Synchrotron XRD techniques are morestraightforward and powerful than conventional XRD with random powder methods f or identifyingnanoparticles in red soils,particularly for illite,kaolinite,goethite,and hematite nanoparticles.Accordingto chemical compositions of clay fractions and red soil features in the Taoyuan terrace,these red soils canbe taken as lateritic red earths or red earths.This work suggests that physicochemical properties andmineral species of red soil at all depths can shed light on the extent of paleo-environmental lateriticweathering.

关键词： 红壤 纳米颗粒 酸碱度指数 矿物种类

作者: Tsung Ming Tsao Ming Kuang Wang

作者单位: Department of Agricultural Chemistry,National Taiwan University,Taipei,Taiwan,10617

会议类型: 国内会议

会议名称: 中国土壤学会第十二届全国会员代表大会暨第九届海峡两岸土壤肥料学术交流研讨会

会议地点: 成都

会议语种:中文

页码: 117-117

在线出版日期: 2012-08-21（万方平台首次上网日期，不代表论文的发表时间）