Adsorption-polarized electrodes (APE) may be successfully applied in coulometric reagent generation. Using a separated generating circuit with four electrodes results resemble those obtained in volumetric titration. The generating anode may be included into the indicating circuit as a guided polarized electrode, too. This three electrode arrangement allows the simultaneous determination of halides with Ag+ in aqueous solution. A high density of specifically adsorbed ions (defective surface of APE) causes a sharper indication for Br−/J−. In special cases the diaphragm in the generating circuit may be abandoned. If a drop of the solution is placed into a loop-shaped generating anode micro-titrations in the range of 10−8-10−10 Val of J− in 50-20 μl may be performed. Br− can only be determined with lower sensitivity. Cl− cannot be determined in purely aqueous solution.