Development of a quantum-cascade laser-based instrument for high sensitivity measurement of nitrous acid

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Laser-based instruments for measurement of gaseous nitrous acid were developed by using techniques of cavity ring-down spectroscopy and wavelength modulation spectroscopy with a continuous-wave quantum cascade laser in the mid-infrared region. The heterogeneous reactions of NO2(g) with water in the presence of 20 mM KI, 20 mM NaBr or 100 mM NaClO4 have been investigated by direct monitoring of HONO(g) in the gas phase. The formation of HONO(g) was decreased by addition of KI or NaClO4, while NaBr have little effect on the formation of HONO(g).