Mineralogical Horizon(A)Evaluation of a Toposequence of Soils Derived from Basalt by Thermal Analysis
作者机构：Department of ChemistryFederal University of RondoniaPorto VelhoBrazil Department of AgronomyState University of MaringaMaringaBrazil
出 版 物：《Journal of Minerals and Materials Characterization and Engineering》 (矿物质和材料特性和工程（英文）)
年 卷 期：2014年第2卷第5期
页 面：374-382页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Toposequence Soil Clay Minerals TG DTG
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.
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