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We investigated the process of a bromination reaction of malonic acid and methylmalonic acid in the Belousov-Zhabotinsky reaction by using a quartz crystal microbalance (QCM). The process involves an enolization reaction as a rate-determining step. We found that, in the step, the variation of Br 2 concentration induced an exactly quantitative shift of a resonant frequency of the QCM, based on the change of the surface mass on the QCM and the solution viscosity and density. This new findingdoi:10.1016/j.ancr.2016.03.002 fatcat:o3g7teqnxfhvfd5qv2uqzu3z6i