⑴ Calibrate and calibrate the pH meter before pH measurement.
(2) To verify the accuracy of the pH meter, for example, after calibrating the pH meter with pH 6.86 and pH 4.00, insert the pH electrode into the pH 9.18 solution, and check whether the displayed value of the instrument is consistent with the pHs value of the standard solution.
⑶Check whether the pH meter needs to be reset during the general accuracy measurement. The pH meter may drift or change after being calibrated and used. Therefore, before the test, insert the electrode into a standard buffer solution that is close to the measured solution, and determine whether it needs to be re-calibrated according to the size of the error.
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