近十几年来,离子选择电极分析技术已在许多领域获得广泛应用,与离子选择电极配套的测量仪器可以归纳为下列三类: (1) 高输入阻抗毫伏计,直接测量离子选择电极电池毫伏值,然后计算被测离子浓度。 (2) 离子活度计,用以测量离子活度的负对数(pX=-1ogo_x)值,仪器按照pX分度,如用来测量pH即为pH计。 (3) 带反对数放大器或微型数据处理机的仪器,可从仪器上直接读出离子浓度,便于记录及打印。关于反对数放大器用于离子选择电极测量是近几年才开始出现的,在此以前Gran在电位滴定法中采用反对数座标作图法,使计算测量结 Ion selective electrode analysis technology has been widely used in many fields for more than ten years. The measuring instruments supporting ion selective electrodes can be summarized into the following three categories: (1) high input impedance millivoltmeter, direct measurement of ion selective electrode battery Volt value, and then calculate the measured ion concentration. (2) ion activity meter, to measure the negative logarithm of ion activity (pX = -1ogo_x) value, the instrument according to pX indexing, as used to measure the pH is the pH meter. (3) Instruments with anti-logarithmic amplifiers or micro-data processors that read ion concentrations directly from the instrument for recording and printing. In recent years, the use of an anti-log amplifier for ion-selective electrode measurements began to occur. In the past, Gran was used in Potentiometric titration with an anti-logarithmic coordinate plot method, which enabled the calculation of the measured junction