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在利用离子选择性电极对溶液的pX值作精密测量时,整个测量过程应保持恒定的温度。在这种情况下,离子计实际上只需要一个电极系数(斜率)校正器,采用二点校正法就能在仪器上直读出pX或pH值。对于某些离子选择电极如pH玻璃电极等,电极系数符合理论值,而且离散率较小,如果仪器输入阻抗又足够高,则电极系数只决定于能斯特方程式中RT/nF的温度因子T。所以在这类专用离子计中,只需要一个温度补偿器和采用一点校正法就可以了。然而在实际工作中,特别在工业流程中往往是标准溶液与样品溶液温度不一致,如果要作相对精密测量时,离子
In the use of ion selective electrode pX value of the solution for precision measurement, the entire measurement process should be maintained at a constant temperature. In this case, the ion meter actually only needs one electrode coefficient (slope) corrector, and the two-point calibration method can read pX or pH directly on the instrument. For some ion-selective electrodes such as pH glass electrode, the electrode coefficient is in line with the theoretical value, and the dispersion rate is small. If the input impedance of the instrument is high enough, the electrode coefficient depends only on the temperature factor T / Nf in the Nernst equation . So in this type of special ion meter, only one temperature compensator and a little correction method are ok. However, in practical work, especially in the industrial process is often the standard solution and the sample solution temperature is inconsistent, if you want to make relative precision measurement, ions