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Amperometry is a technique used to detect ions in a solution based on electrical current produced by electrochemical reaction of an electro-active species.
A reduction reaction will occur when a suitable potential is applied to the electrode: ox + ne → red
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A concentration gradient of ox caused by its depletion at the electrode surface leads to mass transport by diffusion. This leads to a flux of ox, Jox (mol/m2s) that related to the reduction current, ired, through the electrode with an area A according to Faraday’s law:
ired = - nFAJox ↔ Jox = - ired / nFA
Fick's law of diffusion: ......
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Polarographic Electrode
A typical polarographic electrode consists of a silver anode, a gold or platinum cathode and an electrolyte solution (KCl or AgCl). In order to create a sensor, a constant voltage of 0.8 volts is applied to the probe, and a digital meter is installed to read the DO response measured by the sensor.
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