Accurate pH test
In order to maintain a reasonable degree of accuracy when making a pH measurement, proper handling, storage, and use of buffers is important. If the buffers are contaminated or used improperly, the calibration will be in error and all subsequent measurements will be wrong.
• Do not use buffers after their expiration date. Store buffers at controlled room temperature.
• Protect buffers from excessive exposure to air. Always cap the buffer container when storing.
• Before starting calibration, be sure the sensor and the buffer are at the same temperature. If possible, calibrate with buffers having the same temperature as the process.
• Do not return used buffer to the stock bottle. Discard it.