A system was designed based on a sensing process for continuous release of Fe(CN)(6)(4-). A polymer-modified electrode was prepared by electropolymerization of aniline onto a platinum electrode from a solution containing the monomer and Fe(CN)(6)(4-) to form a layer of polyaniline/Fe(CN)(6)(4-) (PA/FCN). The FCN incorporated into the polymer film can be released by applying a sufficient potential. An FCN-selective electrode was used as the counter electrode of the system. As the sensor exhibits potentiometric response to the FCN ions, the generated potential causes the release of Fe(CN)(6)(4-) from the polymer film electrode. The system was examined as a continuous releaser of Fe(CN)(6)(4-) for study of a chemical oscillator as a typical application.