Department of Analytical Chemistry, Jagiellonian University, Kraków, Poland.
Talanta. 1987 Jun;34(6):586-8. doi: 10.1016/0039-9140(87)80196-0.
It has been proved that application of two indicator electrodes connected to the ordinary titration apparatus through an auxiliary electronic device (a summing operational amplifier) significantly extends the scope of multicomponent potentiometric titrations in which the analytes are determined simultaneously from a single titration curve. For each analyte there is a corresponding potential jump on the titration curve. By application of the proposed auxiliary device, the sum of the electrode potentials is measured. The device also enables the relative sizes of the potential jumps at the end-points on the titration curve to be varied. The advantages of the proposed signal processing are exemplified by complexometric potentiometric titrations of Fe(III) and Cu(II) in mixtures, with a platinum electrode and a copper ion-selective electrode as the indicator electrodes.
已经证明，通过辅助电子设备（求和运算放大器）将两个指示电极连接到普通滴定仪上，可显著扩展多组分电位滴定的范围，从而可以从单个滴定曲线上同时测定分析物。对于每个分析物，在滴定曲线上都有相应的电位跃变。通过应用所提出的辅助设备，可以测量电极电势的总和。该设备还可以改变滴定曲线上终点处的电位跃变的相对大小。所提出的信号处理的优点通过使用铂电极和铜离子选择性电极作为指示电极的 Fe(III)和 Cu(II)的络合电位滴定来举例说明。
