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A procedure for development of a pen-like, multi-electrode potentiometric sensing platform is described. The platform comprises a seven-in-one electrode incorporating all-solid state ion-selective and reference electrodes based on the conductive polymer (poly (3,4-ethylenedioxythiophene) (PEDOT)) as an intermediate layer between the contacts and ionselective membranes. The ion-selective electrodes are based on traditional, ionophore-based membranes, while the reference electrode is based on a polymer membrane doped with the lipophilic salt tetrabutyl ammonium tetrabutyl borate (TBA-TBB). The electrodes, controlled with a multichannel detector system, were used for simultaneous determination of the concentration of Pb 2+ and pH in environmental water samples. The results obtained using pH-selective electrodes were compared with data obtained using a conventional pH meter and the average percent difference was 0.3 %. Furthermore, the sensing system was successfully used for lead speciation analysis in environmental water samples.

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