5,10,15,20-Tetraferrocenyl porphyrin, H₂TFcP, a simple example of a donor-acceptor system, was tested as ligand for the development of a novel multi-transduction chemical sensors aimed at the determination of transition metal ions. The fluorescence energy transfer between ferrocene donor and porphyrin acceptor sub-units was considered. The simultaneously measured optical and potentiometric responses of solvent polymeric membranes based on H₂TFcP permitted the detection of lead ions in sample solutions, in the concentration range from 2.7 × 10⁻⁷ to 3.0 × 10⁻³ M. The detection limit of lead determination was 0.27 μM, low enough to perform the direct analysis of Pb²⁺ in natural waters.