HONO from diluted nitrite and sulphuric acid solutions
The HONO source is a device for the continuous generation of pure HONO mixtures in humidified air with a flow rate of 0.5 – 2 l/min. HONO formation is based on the reaction of dilute NaNO2and H2SO4 solution, similar to the study by Taira and Kanda (1990) [[i]]. In contrast to this study, however, a temperature-controlled stripping coil is used as a liquid/gas reactor instead of a bubbler, as described by Kleffmann et al. [[ii]], which show a much faster time response of a few minutes (see Fig. 1).
Fig.1: Example of the variation of the HONO concentration by changing the nitrite concentration. Each data point corresponds to a period of 30 s. The time response of the HONO-LOPAP instrument used here to measure HONO was 3 minutes.
[[i]] Taira, M., Y. Kanda: Continuous Generation System for Low-Concentration Gaseous Nitrous Acid, Anal. Chem.,1990, 62, 630-633.
[[ii]] Kleffmann, J., T. Benter, P. Wiesen: Heterogeneous Reaction of Nitric Acid with Nitric Oxide on Glass Surfaces under Simulated Atmospheric Conditions, J. Phys. Chem. A, 2004, 108, 5793-5799.
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