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).<\/p>\n
<\/p>\n
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.<\/p>\n
[[i]] Taira, M., Y. Kanda: Continuous Generation System for Low-Concentration Gaseous Nitrous Acid, Anal. Chem.,1990, 62, 630-633.
\n[[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.<\/p>\n
In cooperation with:<\/strong><\/p>\n PD Dr. Joerg Kleffmann <\/p>\n
\nPhysical Chemistry\/FB C
\nUniversity of Wuppertal
\nGauss Street 20
\nD-42097 Wuppertal
\nGermany
\nPHONE: +49 202 439 2515
\nFAX: +49 202 439 2505 or 2757
\nEmail: kleffmann@uni-wuppertal.de
\nwww.physchem.uni-wuppertal.de<\/p>\n