My watch list
my.chemeurope.com

Mercury coulometer

Mercury coulometer is based on the electrochemical processes of oxidation/reduction with according of the follow reaction:
Hg2+ +e = Hg
These oxidation/reduction processes have 100% efficienty with the wide range of the current densities. Measuring of the quantity of electricity (coulombs) is based on the changes of the mass of the mercury electrode. Mass of the electrode can be increased during cathodic deposition of the mercury-ions or decreased during the anodic dissolution of the metal.
$Q = \frac{ \Delta\ m*2*F}{200.59}$,
where Q-quantity of electricity (coulombs); $\Delta\ m$-mass changes (gr); F-Faraday constant (96485);