Effect of Treatments of Hydrogen Peroxide and Sodium Dithionite- Citrate-Bicarbonate on Clay Minerals of Red Earth Sediments
LI Rong-biao1, 2, HONG Han-lie1*, YIN Ke1, WANG Chao-wen1, GAO Wen-peng1, HAN Wen1, WU Qing-feng3
1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 2. School of Tourism, Kaili University, Kaili 556011, China 3. College of Physical Sciences and Technology, Yangtze University, Jingzhou 434023, China
Abstract：As classical procedures for pretreatment of soil sediments, hydrogen peroxide (H2O2) and sodium dithionite-citrate-bicarbonate (DCB) treatment methods are very important in removing the organic matter and iron oxides acting as cementing agents in the soils. However, both of these methods have less been focused on the effect on the clay minerals when separating. Here, we report the comparable methods between H2O2 and DCB to reveal their effect on clay minerals in red earth sediments using X-ray diffraction (XRD). The XRD results suggested that mineral particles can be totally decentralized by either H2O2 or DCB method in the soils and high purity clay minerals can be obtained by separating quartz and other impurities from clay minerals effectively. However, the XRD data were distorted by the DCB treatment owning to the cation exchange between Na+ and interlayer cation. On the contrary, the authentic data can be obtained by H2O2 treatment. Therefore, the H2O2 treatment seems to be a more appropriate method to obtain authentic information of clay mineralogy when separating of clay minerals from red earth sediments.
李荣彪1, 2，洪汉烈1*，殷 科1，王朝文1，高文鹏1，韩 文1，吴青峰3 . 过氧化氢和连二亚硫酸钠-柠檬酸钠-碳酸氢钠处理对红土中黏土矿物的影响 [J]. 光谱学与光谱分析, 2013, 33(04): 1122-1125.
LI Rong-biao1, 2, HONG Han-lie1*, YIN Ke1, WANG Chao-wen1, GAO Wen-peng1, HAN Wen1, WU Qing-feng3 . Effect of Treatments of Hydrogen Peroxide and Sodium Dithionite- Citrate-Bicarbonate on Clay Minerals of Red Earth Sediments. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(04): 1122-1125.
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