Abstract
An environmental chamber study of nitrogen oxide reactions is described. The aim of the investigation was to determine (1) the rate of NO/sub x/ transformation to nitrate products, (2) the environmental factors that influence the transformation rate, (3) the relationship between nitrate products and their hydrocarbon and NO/sub x/ precursors, and (4) relationships among NO/sub x/, O/sub 3/, and nitrates. The experiments made use of a 17-component hydrocarbon mixture designed to represent the major organic constituents of urban air. The results of the chamber experiments demonstrate that the transformation of NO/sub 2/ to nitrate products follows pseudo-first-order kinetics, and the transformation rate constant is proportional to the initial NMHC/NO/sub x/ ratio. Nitrogen balances of greater than or equal to90% were obtained when HNO/sub 3/ deposition to the chamber surface was taken into account. The fractional conversion of NO/sub x/ to products was shown to depend on initial NMHC/NO/sub x/. For this particular hydrocarbon mixture, the PAN/HNO/sub 3/ ratio was directly proportional to initial NMHC/NO/sub x/ for NHMC/NO/sub x/ less than or equal to 20. For a typical urban NMHC/NO/sub x/ ratio of 8, about 3 times as much HNO/sub 3/ as PAN is produced in the chamber. The implications andmore » limitations of the experimental results are discussed.« less
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