The only existing techniques to study the composition of a liquid or to detect anomalies and specific compounds in aqueous solutions are cumbersome tools, available only for expert users. By use of a cross-sensitive array of polymeric sensors, the dimensions of an electronic tongue system can be terrifically reduced, up to the creation of a portable device. Incorporating hexacyanoferrate(II) anions ([Fe(CN)6]4-) in polypyrrole membranes allows the films to achieve sensitivity towards monovalent anions and cations, with quasi-Nernstian slopes, during potentiometric characterizations. Literature research and many experiments brought to the ability of depositing film in an extremely reproducible way, on top of electrode with a diameter of 250um.