Investigation of the Atmospheric Ozone Formation Potential of Trichloroethylene (original) (raw)
A series of environmental chamber experiments and computer model calculations were carried out to assess the atmospheric ozone formation potential of propylene glycol (PG). The experiments consisted of determining the effects of adding PG on NO oxidation, ozone formation and integrated OH radical levels in simulated model photochemical smog systems. Experiments were carried out using two different surrogate mixtures to represent the reactive organic gases (ROGs) present in the atmosphere, and using differing ROG/NO x ratios. It was found that PG has a positive effect on ozone formation, and that it does not significantly enhance or inhibit OH radical levels. The rates of consumption of PG in the chamber experiments relative to those of m-xylene corresponded to OH radical rate constant of (2.8±0.6) x 10 -11 cm 3 molec -1 s -1 , which is almost a factor of three higher than the previously reported value of Wiedelmann and Zetzch , but is within the experimental uncertainty of the value recently obtained by . The observed effects of PG on NO oxidation and O 3 formation were inconsistent with the previously determined lower OH + PG rate constant, and were much better predicted by model simulations using the higher rate constants of Aschmann and Atkinson (1997) as determined in this work.
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