TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Fuel Cell System: The impurity collector is a porous drawn fluororesin film. The impurity collector (5a,5c) are installed at inlet portion of the fuel cell. SPECIFIC COMPOUNDS - The chelating agent is at least one type chosen from ethylenediaminetetraacetic acid, hydroxyethyl ethylenediamine triacetic acid, diethylenetriamine penta-acetic acid, triethylenetetramine hexaacetic acid, nitrilotriacetic acid, gluconic acid, hydroxyethyl imino diacetic acid, pyrrolidine and hydroxy ethanediphosphonic acid.    EXAMPLE - Acetylene black having particle size of 35 nm was mixed with aqueous dispersion of polyethylene terephthalate to form water repellant ink. The ink was applied and impregnated on carbon paper and heat processed at 300degreesC to form gaseous diffusion layer having thickness of 200 mum. Catalyst comprising platinum supported on Ketjen Black EC (ketchen black having particle size of 30 nm) (in wt.pts) (66) was mixed with perfluoro carbon sulfonic acid ionomer (33). The obtained mixture was molded to form catalyst layer having thickness of 10-20 mum. The gas diffusion layer and the catalyst layer were laminated on both surfaces of Nafion 112 (polymeric electrolyte film) to form membrane electrode joint component. A rubber gasket board was joined to periphery of the polymeric electrolyte film. An electroconductive separator board obtained by impregnating graphite board with phenol resin was laminated on both surfaces of the joint component to produce cell. Two such cells were laminated to form stacked cell battery. The same pattern was repeated to form 100 cells stacked battery. A current collection board made of stainless steel, an insulation board and an end plate were arranged on both ends of the stacked battery. The whole structure was fixed by fastening rod at a pressure of 15kgf/cm2 per area of separator. A fuel cell was obtained. The fuel cell was integrated in the fuel cell system. Aqueous solution of hydroxyethyl imino diacetic acid was poured into each of the impurity collectors (5a,5c). The fuel cell system had excellent performance characteristics and reliability. The fuel cell comprised in the system had excellent durability. The fuel cell system was operated stably for long period of time. There was no precipitate adsorption of the metal ion species to the catalyst layer surface of the fuel cell.