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For realizing an all-solid-state free chlorine sensor composed of two dissimilar electrodes,dependences of open-circuit potentials on free chlorine concentration in simulated tap water condition were evaluated for several metal electrodes. In this study, stainless steel, tungsten, tantalum, and titanium which are well known metals to form stable passive film on its surface were tested. Although each metal electrode showed different sensitivity, it was found that the electrodes can detect freedoi:10.5162/imcs2018/p2ec.12 fatcat:py52gey63jcebj5hrjp6fru4uy