The development of a thin-layered dual-band electrochemical cell operating at flow conditions is described. Influence of experimental parameters related to the geometric design of the channel electrode as well as the flow rate on the collection efficiency were studied by using ferricyanide as a probe, results being in agreement With predictions from literature. Fiagram responses obtained by injecting thiosulphate +iodide solutions to the carrier electrolyte (1 M Ac-/l M HAc) were evaluated by measuring peak current and charge values at both electrodes. Data showed the influence of the flow rate and the ratio between iodide. and thiosulphate concentrations on the profile of fiagrams recorded at the first electrode and the results are discussed on the basis of both sample dispersion and thickness of the reaction layer. Analytical applications of the proposed generator-collector cell involved titrations with electrogenerated iodine, thiosulphate concentrations as low as 1 muM being. measured with high precision.