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首页> 外文期刊>Bulletin of engineering geology and the environment >Occurrence characteristics of free iron oxides in soil microstructure: evidence from XRD, SEM and EDS
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Occurrence characteristics of free iron oxides in soil microstructure: evidence from XRD, SEM and EDS

机译：土壤微结构中游离氧化铁的赋存特征：来自XRD，SEM和EDS的证据

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摘要

Free iron oxides in soils usually have distinct electrochemical properties, relatively high surface energy, a strong ability to adsorb, and provide structural cementation in the soil. Thus, soil properties are influenced by the content, characteristics and occurrence of free iron oxides. This paper reports a study on Zhanjiang clay and Longmen laterite, both of which are rich in free iron oxides, to investigate the occurrence characteristics of free iron oxides in soils. Dithionite-citrate-bicarbonate solution was adopted to remove free iron oxides from the soils, and qualitative filter paper was used to extract particles with size d < 25 mu m. X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometry were used to analyze alterations in the physical and chemical properties, mineral composition, and microstructure caused by the removal of free iron oxides. The results obtained in this study show that free iron oxides act as a bridge in Zhanjiang clay and mostly in the form of cladding in Longmen laterite. Both forms enhance the cementation and structural strength of the soils and weaken the swelling-shrinkage capacity. The findings of this paper will contribute to a deeper understanding of the formation and failure of soils.
机译：土壤中的游离氧化铁通常具有独特的电化学特性，相对较高的表面能，很强的吸附能力，并在土壤中提供结构固结作用。因此，土壤性质受游离铁氧化物的含量，特性和发生率的影响。本文对湛江黏土和龙门红土进行了研究，二者均富含游离铁氧化物，以研究其在土壤中的发生特征。采用亚硫酸氢盐-碳酸氢盐溶液除去土壤中的游离氧化铁，并使用定性滤纸提取d <25μm的颗粒。 X射线衍射，扫描电子显微镜和能量色散光谱法用于分析由于除去游离氧化铁而引起的物理和化学性质，矿物组成和微观结构的变化。研究结果表明，游离氧化铁在湛江黏土中起桥梁作用，在龙门红土中以覆层形式存在。两种形式都可以增强土壤的胶结作用和结构强度，并削弱其膨胀收缩能力。本文的发现将有助于加深对土壤形成和破坏的认识。

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