论文部分内容阅读
以计量置换吸附理论(SDT A)为基础,从理论上推导出计量吸附模型中表征溶质对固定相亲合势大小的参数βa值与流动相中强置换剂浓度的对数呈线性关系。计量置换模型中的参数n和q(n和q分别代表1摩尔溶剂化溶质被吸附时,从吸附剂表面和从溶质分子表面所释放出的溶剂的物质的量)是计量置换参数Z值的分量,是两个非常有用的参数,可以从这个定量关系中直接获得。推导出的方程用苯的衍生物进行了实验验证,获得了较满意的结果。将这种方法计算得到的分量值与SDT A与计量置换保留模型(SDT R)相结合的方法得到的分量值进行了比较,发现两种方法所得到的分量值符合较好,且n和q都遵循同系物碳数规律。同时也发现当溶质在液 固表面吸附时,从吸附剂上释放出的溶剂分子要比从溶质表面释放出的溶剂分子多(n>q)。
Based on the SDT A theory, a linear relationship between the parameter βa of the solute to stationary phase affinity and the logarithm of the concentration of the strong displacer in the mobile phase was deduced theoretically. The parameters n and q (n and q respectively represent the amount of substance released from the surface of the adsorbent and the solvent released from the surface of the solute molecule when the 1 mol of solvated solute is adsorbed, respectively) in the model of the metered displacement are the values of the Z value The components are two very useful parameters that can be derived directly from this quantitative relationship. The deduced equation has been experimentally verified with benzene derivatives, and satisfactory results have been obtained. Comparing the component values calculated by this method with those obtained by a combination of SDT A and SDT R, it is found that the values obtained by the two methods agree well with each other, and n and q Follow the homologue carbon number law. It is also found that when the solute is adsorbed on the liquid-solid surface, more molecules of the solvent are released from the adsorbent than from the surface of the solute (n> q).