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. A gas detection system has been developed, characterized,and deployed for pressurized gas-phase sample analyses and near-real-timeonline measurements. It consists of a cryogenic pre-concentrator (CryoTrap), a gas chromatograph (GC), and a new high-resolution atomic emission detector(AED III HR). Here the CryoTrap–GC–AED instrumental setup is presented, andthe performance for iodine (1635 ± 135 counts I atom−1 pptv−1), sulfur (409 ± 57 counts S atom−1 pptv−1),carbon (636 ± 69 counts C atom−1 pptv−1), bromine (9.1 ± 1.8 counts Br atom−1 pptv−1), and nitrogen (28 ± 2 counts N atom−1 pptv−1) emission lines is reported and discussed.The limits of detection (LODs) are in the low parts per trillion by volume range (0.5–9.7 pptv),and the signal is linear to at least 4 orders of magnitude, which makes it asuitable method for diverse volatile organic compound (VOC) measurements inthe atmosphere, even in remote unpolluted regions. The new system wasutilized in a field study in a boreal forest at Hyytiälä, Finland, inlate summer 2016, which made monoterpene measurements possible among otherVOCs. Furthermore, pressurized global whole-air samples, collected on boardthe Lufthansa Airbus A340-600 IAGOS–CARIBIC aircraft in the uppertroposphere and lower stratosphere region, were measured with the new setup,providing data for many VOCs, including the long-lived organosulfur compoundcarbonyl sulfide.

Atomic emission detector with gas chromatographic separation and cryogenic pre-concentration (CryoTrap–GC–AED) for atmospheric trace gas measurements