The standardisation of a pH meter is important to ensure that the readings returned from that meter are accurate. Digital & analogue pH meters offer calibration buttons or dials that are used to adjust the sensitivity of the meter. Over the course of standard usage, laboratory equipment, such as a pH meter, loses accuracy and requires standardisation. Standardisation should be performed regularly.
- Skill level:
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Things you need
- Standardisation solutions (solutions of known pH)
- De-ionised water
- Paper towels
Place the reading end of the pH meter into a standardised solution.
Compare the reading on the meter with the known pH of the solution.
Use the calibration buttons to change the reading on the meter until it matches that of the standardised solution.
Rinse the reading end of the pH meter generously with the ionised water and dry with paper towels.
Repeat this process with several standardised solutions to ensure the accuracy of the pH meter.
Tips and warnings
- When selecting standardisation solutions, it is important to select both basic and acidic solutions. This ensures that both ends of the reading spectrum are properly calibrated.
- It is important to thoroughly rinse and dry the reading end of the pH meter between readings. This ensures that the standardisation solutions are not contaminated and prevents erroneous readings.
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