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The kinetics of oxidation of N-methyl-p-aminophenol (metol) by H20 2 in the presence of trace levels ofFe m have been studied in an HC104 medium. The reaction mechanism is complex and the catalytic role of Fe nl in the sulphato form is indicated. The following rate law accounts for the experimental observations: --d[HzO2]/dt = /<;in 4-K 1 K2 [metol] [H202] [Fe 3 +] (k 1 + kzl-metol] ) 1 + Kl[metol] + K~K2Emetol] [H202]where kiun is the initial rate for the uncatalysed reaction. The equilibrium constants K1 and K 2 are the formation constants for the complexes [Fe(metol)l 3+ and [Fe-(metol)(H202)] 3 +, respectively. The catalytic role of Fem is explained by considering a ternary complex in the transition state.