Agriculture Reference
In-Depth Information
Instrument
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pH meter
pH is the measure of the dissolved hydrogen ion concentration in a
solution. The pH range of 0-14 accounts for hydronium activities from
10 to 1E-14 mol/l. A pH meter measures the pH of a solution utilizing
a glass electrode. A pH meter measures essentially the electrochemical
potential between a known liquid inside the glass electrode (membrane)
and an unknown liquid outside. Because the thin glass bulb allows mainly
the agile and small hydrogen ions to interact with the glass, the glass
electrode measures the electrochemical potential of hydrogen ions or the
potential of hydrogen . A pH meter must not be used in moving liquids of
low conductivity (thus, measuring inside small containers is preferable).
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