The temperature compensation effect of one and pH meter

The temperature compensation of the pH meter should contain three parts: the temperature compensation of the slope of the electrode, the temperature compensation of the electrode and the reference electrode. Temperature compensation and pH on the set, only the slope compensation electrodes (2.303RT/F). Therefore, the temperature compensation is not very sufficient for the measurement of the pH meter, and the error caused by the temperature can not be completely eliminated. Only because of the temperature term of the solution and the temperature of the zero point of the electrode, one is unsure, and the error caused by the two is very small, so it is omitted.

Two, common sense of pH electrode correction

When the pH electrode is used for a period of time, the asymmetric potential will change greatly, so it must be calibrated regularly. The pH electrode calibration depends on the number of samples, and requirements on the measurement accuracy of the electrode performance. High precision measurement (less than 0.03pH), should be timely calibration; the general accuracy of measurement (= + 0.1pH), after a calibration can be used continuously for two weeks or longer. As long as the measurement shows that the pH value is accurate, it is not necessary to calibrate the electrode frequently. A standard solution that is close to the measured solution is tested first, depending on the size of the error to determine whether to recalibrate.