Any pH meter must be calibrated by pH standard solution to measure the pH value of the sample. For samples with measurement accuracy below 0.1pH, the instrument can be adjusted by a little calibration method. Generally, the pH is 6.86 or pH7.00. Buffer. Some instruments have an accuracy of only 0.2pH or 0.1pH, so the instrument only has a “positioning†adjustment knob. The specific steps are as follows:
(1) Measure the standard buffer temperature, check the table to determine the pHs at this temperature, and adjust the temperature compensation knob to this temperature.
(2) Rinse the electrode with pure water and dry.
(3) After immersing the electrode in the buffer solution, shake it and place it still. After the reading is stable, adjust the positioning knob to make the instrument display the pH value of the standard solution.
(4) Remove the electrode and rinse.
(5) Measure the sample temperature and adjust the pH meter temperature compensation knob to this temperature value.
(6) Immerse the electrode in the sample solution, shake it and place it still, showing a stable reading.
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