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Hydroxy naphthol blue (HNB) has been a well-known reagent for Mn (II) catalitic analysis, and decomposes with only Mn (II) in the presence of hydrogen peroxide. When tiron is used as an activator, HNB is available for the determination of a trace amount of cobalt(II). By investigating the determination conditions for cobalt(II), it was found that the reaction rate of HNB decomposition decreased with increasing tem-

Effect of temperature on the decomposition reaction of hydroxy naphthol blue in the presence of cobalt(II) and hydrogen peroxide.