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4) Alcock. N. J.; Corbelli, L.; Games, D. E.; Lant, M. S.; Westwood, S. A.Spectra for inorganic gases common to combustion emisdons were obtained in air by using negative ion mobility spectrometry (NIMS). Gases were characterized individuaiiy from 10 to over 4000 ppb in alr and in two binary mixtures of S02/N02 and HCI/SOP. Spectra for HCI and SO2 were distinguished by single Intense peaks at reduced mobilities ( K O ) of 2.98 cm2/(V 8 ) and 2.30 cm2/(V s), respectively. The product ion for NO, had a KO of 2.80 cm2/(V 8 ) as determined using binary mixture studies and was unresolved otherwise from reactant Ions. I n contrast, NIMS spectra for H2S showed three peaks that were concentration dependent and had mobility values of 2.38, 2.28, and 1.70 cm2/(V 8 ) . Peak currents for H2S ranged from 10 to 50 pA and the estimated limit of detection (LOD) was 10 ppb. Peak currents for SO2 ranged from 15 to 65 pA and the estlmated LOD was 2 ppb. The range of peak currents for HCI was comparatively large at 140-215 pA and estimated LOD was <1 ppb. At constant concentration for HCI at 60 ppb, SO2 was added from 100 to 900 ppb. Competitive Ionization was observed in the order Of HCI > NO2 > SOP

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