The rapid estimation of the layer charges of 2:1 expanding clays from a single alkylammonium ion expansion
The rapid estimation of the layer charges of 2:1 expanding clays from a single alkylammonium ion expansion
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通过单个烷基铵离子膨胀快速估算 2:1 膨胀粘土的层电荷
DOI：
10.1180/claymin.1990.025.1.05
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发表时间：
1990
期刊：
影响因子：
1.5
通讯作者：
L. A. Douglas
中科院分区：
文献类型：
--
作者：
A. C. Olis;P. Malla;L. A. Douglas
摘要 提出了一种快速估计蒙脱石和蛭石中平均总层电荷和电荷位置的经验方法，涉及在 Greene-Kelly 测试之前和之后与长链烷基铵离子的交换。该方法利用 XRD 基础间距与平均层电荷之间的经验确定关系，该关系是通过传统的正烷基铵离子交换技术计算得出的，使用简单的线性回归模型来描述单层-双层和双层-假三分子层转变的关系。该方法可以快速估计这些电荷参数，并有助于正确识别蒙脱石和蛭石，符合 AIPEA 基于总层电荷的分类标准。它被认为优于主要基于膨胀和塌陷行为的传统区分方法。
Abstract An empirical method to estimate rapidly both mean total layer charge and location of charge in smectites and vermiculites is presented, involving exchange with a long-chain alkylammonium ion before and after the Greene-Kelly test. The method utilizes an empirically determined relationship between XRD basal spacings and the mean layer charges calculated from the conventional n-alkylammonium ion-exchange technique using simple linear regression models to describe the relationships for both monolayer-bilayer and bilayer-pseudotrimolecular layer transitions. The method provides a rapid estimation of these charge parameters and facilitates the proper identification of both smectites and vermiculites consistent with the AIPEA criteria for classification based on total layer charge. It is considered superior to conventional methods of differentiation based mainly on expansion and collapse behaviour.