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. The Norwegian Arctic possesses a unique environment forthe detection of new potential chemicals of emerging Arctic concern (CEACs)due to remoteness, sparse population and the low number of localcontamination sources. Hence, a contaminant present in Arctic air is stillconsidered a priority indication for its environmental stability andenvironmental mobility. Today, legacy persistent organic pollutants (POPs)and related conventional environmental pollutants are already well-studiedbecause of their identification as Arctic pollutants in the 1980s. Many of themare implemented and reported in various national and internationalmonitoring activities including the Arctic Monitoring and Assessment Programme(AMAP). These standard monitoring schemes, however, are based on compound-specific quantitative analytical methods. Under such conditions, thepossibility for the identification of hitherto unidentified contaminants islimited and random at best. Today, new and advanced technologicaldevelopments allow a broader, unspecific analytical approach as eithertargeted multicomponent analysis or suspect and non-target screeningstrategies. In order to facilitate such a wide range of compounds, awide-scope sample clean-up method for high-volume air samples based on acombination of adsorbents was applied, followed by comprehensivetwo-dimensional gas chromatography separation and low-resolutiontime-of-flight mass spectrometric detection (GC × GC-LRMS). Duringthe study reported here, simultaneous non-target and suspect screening wereapplied. The detection of over 700 compounds of interest in the particlephase and over 1200 compounds in the gaseous phase is reported. Of those, 62 compounds were confirmed with reference standards and 90 compounds with aprobable structure (based upon mass spectrometric interpretation and libraryspectrum comparison). These included compounds already detected in Arcticmatrices and compounds not detected previously (see alsoFig. 1). In addition, 241 compounds were assigneda tentative structure or compound class. Hitherto unknown halogenatedcompounds, which are not listed in the mass spectral libraries used, werealso detected and partly identified.

atmospheric chemistry and physics

Non-target and suspect characterisation of organic contaminants in Arctic air – Part 2: Application of a new tool for identification and prioritisation of chemicals of emerging Arctic concern in air