Correction of mass drift in ac-electrogravimetry of Prussian Yellow films. Mass impedance under apparently non-steady state condition

- Mass impedance data can be obtained under apparently non-steady state conditions.
- The dc and the ac contributions of the mass response during an impedance experiment can be separated.
- Anions can participate as counterions during the oxidation of Prussian Blue to Prussian Yellow.
- The rate of dissolution of PB films is related with the participation of anions.