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Amines and amides are important atmospheric organic-nitrogen compounds but\udhigh time resolution, highly sensitive, and simultaneous ambient\udmeasurements of these species are rather sparse. Here, we present the\uddevelopment of a high-resolution time-of-flight chemical ionization mass\udspectrometer (HR-ToF-CIMS) method, utilizing protonated ethanol as reagent\udions to simultaneously detect atmospheric gaseous amines (C1 to\udC6) and amides (C1 to C6). This method possesses sensitivities of 5.6–19.4 Hz pptv−1 for amines and 3.8–38.0 Hz pptv−1\udfor amides under total reagent ion signals of  ∼  0.32 MHz. Meanwhile, the detection limits were 0.10–0.50 pptv for amines and 0.29–1.95 pptv for\udamides at 3σ of the background signal for a 1 min integration time. Controlled characterization in the\udlaboratory indicates that relative humidity has significant influences on\udthe detection of amines and amides, whereas the presence of organics has no\udobvious effects. Ambient measurements of amines and amides utilizing this\udmethod were conducted from 25 July to 25 August 2015 in urban Shanghai,\udChina. While the concentrations of amines ranged from a few parts per trillion by volume to hundreds\udof parts per trillion by volume, concentrations of amides varied from tens of parts per trillion by volume to a few parts per billion by volume.\udAmong the C1- to C6-amines, the C2-amines were the dominant\udspecies with concentrations up to 130 pptv. For amides, the C3-amides\ud(up to 8.7 ppb) were the most abundant species. The diurnal and backward\udtrajectory analysis profiles of amides suggest that in addition to the\udsecondary formation of amides in the atmosphere, industrial emissions could\udbe important sources of amides in urban Shanghai. During the campaign,\udphoto-oxidation of amines and amides might be a main loss pathway for them\udin daytime, and wet deposition was also an important sink

atmospheric chemistry and physics

Detection of atmospheric gaseous amines and amides by a high-resolution time-of-flight chemical ionization mass spectrometer with protonated ethanol reagent ions