For a pH meter, the main role of the pH buffer solution
(1) Calibrate and calibrate the pH meter before pH measurement.
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(2) It is used to test the accuracy of the pH meter, for example, after calibrating the pH meter with pH6.86 and pH4.00, insert the pH electrode into the pH9.18 solution, and check whether the displayed value of the instrument is consistent with the pHs value of the standard solution.
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(3) Check whether the pH meter needs to be re-calibrated when measuring the general accuracy. After the pH meter is calibrated and used, it may drift or change. Therefore, before the test, insert the electrode into the standard buffer solution that is close to the solution to be tested, and determine whether it needs to be re-calibrated according to the size of the error.
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⑷Check the performance of the pH electrode.
