Mineralogical Horizon(A)Evaluation of a Toposequence of Soils Derived from Basalt by Thermal Analysis  

作　　者：Wilson Sacchi Peternele Antonio Carlos Saraiva da Costa 

机构地区：[1]Department of Chemistry,Federal University of Rondonia,Porto Velho,Brazil [2]Department of Agronomy,State University of Maringa,Maringa,Brazil

出　　处：《Journal of Minerals and Materials Characterization and Engineering》2014年第5期374-382,共9页矿物质和材料特性和工程（英文）

摘　　要：Thermogravimetry (TG) is a technique where the mass change of a substance is evaluated in function of temperature or time at a constant temperature while submitted to a controlled program in a specific environment. The minerals obtained from a clay fraction are highly susceptible to significant changes in composition as a response to thermal processes in function of temperature or dynamic as a function of time at a constant temperature. Thermogravimetric curves (TG) show mass changes preferentially during the heating processes. The DTG curve derived from the TG curve, shows changes in the inclination that are not exposed in the TG curve. DTG curve thus can show higher values of mass loss which are associated to an elevated degree of weathering for those reactions which involve mass changes, such as desorption, dehydration and reactions of dehydroxilation, observed in clay fraction without iron oxide-hydroxide, indicating kaolinite as a dominant mineral, with higher value 70.97% of the fraction to soil class LVdf.Thermogravimetry (TG) is a technique where the mass change of a substance is evaluated in function of temperature or time at a constant temperature while submitted to a controlled program in a specific environment. The minerals obtained from a clay fraction are highly susceptible to significant changes in composition as a response to thermal processes in function of temperature or dynamic as a function of time at a constant temperature. Thermogravimetric curves (TG) show mass changes preferentially during the heating processes. The DTG curve derived from the TG curve, shows changes in the inclination that are not exposed in the TG curve. DTG curve thus can show higher values of mass loss which are associated to an elevated degree of weathering for those reactions which involve mass changes, such as desorption, dehydration and reactions of dehydroxilation, observed in clay fraction without iron oxide-hydroxide, indicating kaolinite as a dominant mineral, with higher value 70.97% of the fraction to soil class LVdf.

关 键 词：TOPOSEQUENCE Soil Clay Minerals TG DTG 

分 类 号：R73[医药卫生—肿瘤]