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Can the HOBO MX2501 pH Logger be Used with the Total Hydrogen Scale (pHT)?
The Total Hydrogen Scale (pHT) requires custom buffers that are designed to mimic the activity of hydrogen ions in seawater.
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Custom pH Buffers to Calibrate the HOBO MX2501 pH Logger
The HOBO MX2501 pH logger calibration procedure is only designed to work with National Bureau of Standards (NBS) pH buffers 4.01, 7.00, and 10.00.
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How to Warm/Cool Calibration Buffers so they Match my Sample
Calibration buffers are solutions of salt dissolved in pure water with known pH values at varying temperatures.
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Wiping the Electrodes Between pH Buffers - Don't Do It!
When calibrating a pH electrode, the user is mitigating the effect of the condition of the electrode, among other factors.
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Why Do I Always Have to Calibrate in pH 7.00 and Then at Least One Other Buffer?
pH is considered an inferred value. This means that raw data (in this case potential as mV and temperature) are used to calculate pH with a known algorithm called the Nernst Equation.
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Using a Three-Point pH Calibration versus a Two-Point pH Calibration
In order to guarantee the accuracy of your readings, it is necessary to bracket the expected pH values with at least two buffers.
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Calibrating for pH at Temperatures Other than 25°C
The observed pH of the buffers (and samples) varies depending on temperature.
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