Pyrite and marcasite may be used as the indicating electrode in neutralization reactions. In acid solution the pyrite and marcasite electrodes behave almost identically with the platinum electrode with differences arising (1) in the presence of strong oxidizing agents where the attack on the pyrite and marcasite alters the potential, and (2) long standing where changes result from the dissolution of a little pyrite even under non-oxidizing conditions. Pyrite and marcasite can thus be used as indicator electrodes in oxidation-reduction titrations. A pyrite-platinum pair gives a differential titration curve. In alkaline solution pyrite, marcasite and platinum respond almost identically to changes in the concentration of sulfide, the single electrode potentials being shifted 120 mv. negative for each ten-fold increase in sulfide concentration.
Proceedings of the Iowa Academy of Science
©1965 Iowa Academy of Science, Inc.
Pringle, David L. and Diehl, Harvey
"The Pyrite and Marcasite Electrodes,"
Proceedings of the Iowa Academy of Science, 72(1), 161-168.
Available at: https://scholarworks.uni.edu/pias/vol72/iss1/26