In this paper, in order to examine the advisability of using graphene for inhibiting decrease in resistivity of pure water, the resistivity of three types of pure water as below were measured and compared: (i) pure water in which graphene-coated spheres were immersed, (ii) pure water in which stainless steel spheres were immersed, and (iii) pure water in which no metallic spheres were immersed. As a result, the pure water in which the graphene-coated spheres were immersed and the pure water in which no metallic spheres were immersed had similar resistivity, and the pure water in which stainless steel spheres were immersed had a lower resistivity than the others. Therefore, it was considered that graphene could suppress the dissolution of metallic ions in pure water.

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