Reactive uptake on hydrocarbon soot: Focus on NO2

The heterogeneous reactivity of NO2 with soot, two combustion products typi cally produced in close proximity, may have significant implications for th e chemistry occurring in the atmosphere, especially the urban troposphere. As the soot produced in the environment is not well characterized, the inte raction of NO2 with a number of different types of laboratory-generated soo t was studied. The production of HONO was observed in the interaction of NO 2 with methane, propane, hexane, and kerosene soot. It was found that soot produced from hydrocarbons catalyzed the reaction of NO2 with H2O to give M ONO. Reactive uptake coefficients for this process that are measured in the laboratory may not be easily applied to atmospheric calculations without m ore information.