⑴ Calibrate and calibrate the pH meter before pH measurement.
(2) Da biste provjerili točnost pH metra, na primjer, nakon kalibracije pH metra s pH 6.86 i pH 4.00, umetnite pH elektrodu u otopinu pH 9,18 i provjerite je li prikazana vrijednost instrumenta u skladu s pH vrijednosti standardne otopine.
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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