Galvanic Cell or electrolytic cell ? What is the detection technique?
There are two techniques:
-semi micro method or volumetric titration
Karl fisher reagent is added to the titration vessel. The reagent contains an alcohol, a base, SO2 and I2. Briefly: as long as there is water I2 is consumed, at the endpoint the excess of I2 is detected by two polarized Pt electrodes. Polarization is achieved by a constant current or constant potential difference.
-micro method or coulometric titration
The I2 is generated by a second set of Pt electrodes, the amount of current allows calculation of the amount of generated I2( colorimetric) End point detection as above.
Google 'karl fisher' for more info
The coulometric titration is can detect low level moistures e.g.: 0.01%. The volumetric titration is recommended for higher level moisture detection.
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