What is a pH calibration slope, and what value should it be?

Dokument-ID

Dokument-ID TE486

Veröffentlichungsdatum

Veröffentlichungsdatum 18.08.2020
Frage
What is a pH calibration slope, and what value should it be?
Zusammenfassung
pH Calibration Slope
Antwort
The calibration slope is a conversion that the pH meter uses to convert the electrode signal in mV to pH. The meter determines the slope by measuring the difference in the mV reading of two different buffers and divides it by the difference in pH of the buffers.

For example:

If the electrode reads 2 mV in the 7 buffer, and 182 mV in the 4 buffer, the slope is (2-182)/(7-4) or -60 mV per pH unit. The theoretical slope value is -58 (+/- 3) mV per pH unit, so typically any value between -55 and -61 mv is acceptable for calibration.

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