Autoxidation of NO in aqueous solution

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Abstract
The reaction of NO with O2 has been investigated in aqueous solution. As demonstrated by ion chromatography, the sole product is NO2−. Kinetic studies of the reaction by stopped‐flow methods with absorbance and conductivity detection are in agreement that the rate law is ‐d[O2]/dt=k[NO]2[O2] with k = 2.1 × 106 M−2 s−1 at 25°C. This rate law is unaffected by pH over the range from pH 1 to 13, and it holds with either NO or O2 in excess. By studying the reaction over the temperature range from 10 to 40°C, the following activation parameters were obtained: ΔH≠ = 4.6 ± 2.1 kJ mol−1 and ΔS≠=−96 plusmn; 4 J K−1 mol−1. © 1993 John Wiley & Sons, Inc.