to be used in analytical chemistry . Through combining the techniques of QCM with classic electrochemical techniques, the electrochemical quartz crystal microbalance (EQCM) was created. EQCM is a new device used to perform the process of electrogravimetry. This device employs a high frequency acoustic wave generated by a piezoelectric resonator to store and dissipate energy infused into the device’s interfacial region. Electrogravimetry has been useful in polymer studies, copper electrodeposition, gold oxidation in an acidic medium, and passivity of iron in a sulfuric medium, as well as Ionic insertion in WO3. References Electroanalytical methods