Ozone is an important oxidant in the troposphere, and its reactions with reactive gases are important processes in the troposphere, which has a significance for the research on countermeasures of air pollution. The simulative reaction equipment of smog chamber, made in our laboratory, was used to study ozone reactions with acetylene in terms of monitoring instruments of ozone analyzer and gas chromatography. A mean value of 4.13×10^－21 cm³•molecule^－1•s^－1 for rate constant was obtained from four experiments under room temperature of about 15 ℃. Its variant coefficient is 7%. Our rate constant is within the range reported by other researchers using different experimental conditions and detecting methods. Results show that the precision of determination of rate constants is high from our experiments. Our self-made simulation system of smog chamber for atmospheric reactions is reliable, which can be applied to deep research of other ozone reactions under atmospheric ozone concentrations. Our results and experimental system provide a good basis for further research on chemical reactions of other important reactive gases in the atmosphere.

Key words: ozone, acetylene, kinetics, rate constant