An inhibitor method for measuring the initiation rate is proposed for the system Fe3+ +
H202.The number of chains terminated by one C(NO& molecule was estimated in specific photochemical experiments and found to be unity. The initiation appeared to involve two processes. The first is proportional to the first power of ferric ion concentration, and the second to the second power. The rate constants and activation energies of these processes are determined. Allowance for the second initiation process permitted qualitative and quantitative description of various reported data on H202 decomposition rates over a wide range of Fe3+, H202, and H+ concentrations. C(N02)4 was used as inhibitor.
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