Calibration of pH Meter
To calibrate a pH meter, follow these steps:
Preparation
- Clean the electrode- Rinse it with distilled water and gently blot it dry with a lint-free tissue.
- Choose the buffer solutions:
Typically, you use two or three standard buffer solutions, such as pH 4.00, pH 7.00, and pH 10.00, depending on the range you are measuring.
Calibrate with Buffer Solutions
- Start with pH 7.00 buffer solution:
- Place the electrode in the pH 7.00 buffer solution.
- Wait for the reading to stabilize.
- Adjust the meter to read pH 7.00 (if necessary) following your device’s instructions.
- Calibrate with the second buffer solution (pH 4.00 or pH 10.00):
- Rinse the electrode with distilled water, blot it dry, and place it in the second buffer solution (pH 4.00 or pH 10.00).
- Allow the reading to stabilize.
- Adjust the meter to match the correct pH value of the buffer solution.
- (Optional) Third calibration:
- For more precision, repeat with the third buffer solution (if applicable).
Final Steps
- Rinse the electrode with distilled water after each buffer solution.
- After calibration, test the meter with a different buffer solution to verify accuracy.
Important Tips
- Regularly clean the electrode to avoid contamination.
- Perform calibration before each use or at regular intervals, especially if accuracy is critical.
- Store the electrode in a proper storage solution when not in use.
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Resource Person: Fredrick Mutua Mwaniki
