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A discharge-flow stirred reaction system has been used to measure the rate constant for the reaction O(3P) + Hz -+ OH + H over the temperature range 315-490K. Below 350K, carbon monoxide (< 5 %

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Reactions in gas phase mixtures of H z 0 2 vapour, NO2 and CO at 292k 2 K have been studied by measurement of the variation of yield of the COz product. It has been shown that the mechanism is the chain reaction sequenceprovided that excess NOz is present. second and third order for M = CO at pressures of 8 and 13.3 kN m-2.An estimate of k4/k2 is obtained which is rationalised in terms of reaction (4) being between Addition of n-butane to the mixture induces the reactionOH+n-C4HIo-+H20+n-C4H9. ( 8)From the resultant decrease in the kinetic chain length a ratio of ks/kz = 14.8 If: 0.9 is deduced, in good agreement with ratios of available absolute values of ks and k 2 .It is considered that the H202 +NO2 + CO + substrate reaction system provides a useful nonphotolytic source of OH-tsubstrate rate constant data relative to k2, of wider application than photolytic sources so far developed.