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一、离子选择电极分析法的特点近十余年来,离子选择电极分析法得到了迅速的发展。电极法最为引人注目的特点是简便和快速。原则上说,常用的直接测定(即标准比较)法只需将离子电极和参比电极插入试样溶液中,可直接从离子计或E-lga(或lgc)校正曲线上读出结果。由于可不破坏试液的组成,所以本法适用于在线监测。与其他的仪器分析法相比,本法所用仪器价廉,也比较轻便,能用电池供电,所以此法便于推广普及,适于野外和现场分析。考虑采用电极分析法时,尤应注意的是:(1)离子电极响应的是活度,而不是浓度,只有通过适当的校正,才能得到待测物的浓度。某些场合必须要测定活度,如研究化学反应的速率和平衡、测
First, the characteristics of ion-selective electrode analysis Nearly ten years, the ion-selective electrode analysis has been rapid development. The most striking feature of the electrode method is simplicity and speed. In principle, the commonly used direct measurement (ie, standard comparison) method simply inserts the ion and reference electrodes into the sample solution and reads the results directly from the ion meter or E-lga (or lgc) calibration curve. Because it does not destroy the composition of the test solution, so this method is suitable for online monitoring. Compared with other instrumental analysis methods, the instruments used in this method are cheap and relatively portable, and can be powered by batteries. Therefore, this method is convenient for popularization and popularization and suitable for field and field analysis. Consider the use of electrode analysis, particular attention should be paid to: (1) The ion electrode responds to activity rather than concentration, and the concentration of the analyte can only be obtained by appropriate calibration. In some cases, it is necessary to measure the activity, such as studying the rate and equilibrium of chemical reactions