中文摘要：

采用氯化铵交换-原子吸收光谱法和CaCl21-甲醛缩合法测定3个金云母-蛭石间层矿物样品的各阳离子交换分量和阳离子交换总量，通过分析样品粒度和溶液pH值对阳离子交换容量的影响及晶层端面水解使表面荷电的特点，确定样品的等电点。结果表明，随着粒度的增大，样品的阳离子交换容量逐渐减小；随着PH值的增大，样品的阳离子交换容量先急剧减小（pH=2～5），后趋于平缓（pH=5～9），而后再急剧减小（pH=9～11．5），这些变化主要与晶层端面的水解作用和八面体片阳离子的溶出作用有关；样品的等电点为PH值≈9。研究结果对于排除端面水解作用对阳离子交换容量的影响和进一步确定蛭石晶层的层电荷具有重要的意义。

英文摘要：

The cation exchange capacity （CEC） of different cation and the total CEC have been determined by the ammonium chloride exchange-atom absorption spectrograph methods and the CaCl2-formaldehyde condensation method for three phlogopite-vermiculite interstratified mineral samples. Influences of the sample granularity and the pH value of the solution on the CEC have been studied. On analysis of hydrolyzation and charge of the surface at the crystal layer edge,the isoelectric point has been confirmed. The result indicated that, along with granularity enlargement, the CEC of the samples reduced gradually. But along with pH value enlargement,the CEC of the samples reduced sharply initially （pH=2-5）, then went gently （pH=5-9）, finally reduced sharply again （pH=9-11. 5）. These changes mainly relate with the hydrotyzation of the surface at the crystal layer edge and the dissolution of cation in the octahedral sheets. This is very significant for eliminating influence of the hydrolyzation of the surface at the crystal layer edge to the CEC and accurately determining the layer charge number of vermiculite crystal layer.