pH Hydrogen Electrode pHydrunio
Gaskatel's pH electrode pHydrunio is the world's first pH electrode combining two hydrogen electrodes into one combination electrode.
Description pHydrunio
Gaskatel’s phydrunio pH electrode is the world’s first pH electrode combining two hydrogen electrodes into a combination electrode.
Platinum-hydrogen electrodes are the only electrodes that directly measure hydrogen ion activity.
Our hydrogen pH electrode has a low resistance.
The pH electrode supplies itself with hydrogen gas from an internal source that can be easily replaced.
pHydrunio does not contain any toxic heavy metals.
The platinum hydrogen electrode is the only electrode whose potential is determined directly by the hydrogen ions activity. The pH-value and the hydrogen potential are directly connected with each other. The potential, depending on the pH-value, can be calculated by means of the Nernst equation.
So, it comes naturally to mind to combine two platinum hydrogen reference electrodes to a combination electrode to create a new platinum hydrogen pH electrode. That was enabled by the miniaturization of the hydrogen electrode HydroFlex. Two platinum hydrogen electrodes are combined to a pH electrode. The interior hydrogen electrode is the reference electrode. It must immerse in a buffer of a known pH-value. The ionic connection to the measuring solution is made by a diaphragm. The outer platinum hydrogen electrode is the actual measuring electrode (outer electrode). The voltage is tapped via a voltmeter between the two platinum hydrogen electrodes.
The measuring voltage and the pH-value are related to each other.
U = (2,303 * R * T) / F * (pHinside - pH)
The measuring voltage can be converted into the pH-value by adjusting the equation.
pH = pHinside - (U * F) / (2,303 * R * T)
U = Measured voltage in Volt
F = Faraday constant 96485 C mol1
R = Universal gas constant 8,314 J mol-1 K1
T = Temperature in Kelvin K
pHinside = 7
Simplified, the equation for the converting of the measured voltage U into the pH-value is:
pH = 7 - U * 5039.1 / (273,15 + T)
Would you like to learn more about the pH electrode pHydrunio?
Principles of the pH-value Measurement with Hydrogen Electrodes
The hydrogen potential directly depends on the activity or rather the concentration of the hydronium ions and thus on the pH-value of the solution.
The World's First Hydrogen Platinum pH Electrode pHydrunio
pHydrunio is the logical further development of our mini platinum hydrogen electrode Mini-HydroFlex. Here you will find some general information about it.
How to Work with the pH Electrode pHydrunio
Here you will find information on commissioning, maintenance and troubleshooting of the pH electrode pHydrunio.
Are you convinced to purchase one of our pH electrodes?
pH Electrode pHydrunio
pHydrunio is the world’s first commercially available hydrogen pH electrode. It can be used from pH -2 to pH 16 and in concentrated fluoride-containing media.