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• W4220890103 endingPage "134381" @default.
• W4220890103 startingPage "134381" @default.
• W4220890103 abstract "Nitroaromatic compounds (NACs) as important constituents of atmospheric humic-like substances (HULIS) and brown carbon (BrC) affect the Earth's climate and pose a serious environmental hazard. We investigated seasonal size-segregated NACs in aerosol samples from the urban background environment in Ljubljana, Slovenia. Total concentrations of twenty NACs in PM15.6 were on average from 0.51 ng m-3 (summer) to 109 ng m-3 (winter), and contributed the most to submicron aerosols (more than 74%). Besides 4-nitrocatechol (4NC) as the prevailing species, methylnitrocatechols (MNCs) and nitrophenols (NPs), we reported on some very rarely mentioned, but also on five novel NACs (i.e., 3H4NBA: 3-hydroxy-4-nitrobenzoic acid, 3MeO4NP: 3-methoxy-4-nitrophenol, 4Et5NC: 4-ethyl-5-nitrocatechol, 3Et5NC: 3-ethyl-5-nitrocatechol and 3MeO5NC: 3-methoxy-5-nitrocatechol). Concentrations of 3MeO5NC, 4Et5NC and 3Et5NC were enhanced during cold seasons, contributing up to 11% to total NAC in winter. In cold season, NAC size distributions were characterized with the peaks in the broader size range of 0.305-1.01 μm (accumulation mode), with 4NC and alkyl-nitrocatechols (∑(M/Et)NC) as the most abundant, followed by 4-nitrosyringol, nitrophenols and nitroguaiacols. In spring, a pronounced peak of ∑(M/Et)NC was observed in the accumulation mode (0.305-0.56 μm) as well as in the coarse one. A strong correlation of all NACs with ∑(M/Et)NC and levoglucosan indicates that primary emissions of wood burning were the most important source of NACs, but their secondary formation (e.g., aqueous-phase at higher ambient RH) in cold season could also be a significant one. In warmer season, NACs may be mostly derived from traffic-related aromatic VOCs. The contribution of NACs to the light absorption of the aqueous extracts was up to 10-times higher (contribution to Abs365 up to 31%) than their mass contributions to WSOC (up to 3%) of corresponding size-segregated aerosols, confirming that most of the identified NACs are strong BrC chromophores." @default.
• W4220890103 created "2022-04-03" @default.
• W4220890103 creator A5028145036 @default.
• W4220890103 creator A5072741347 @default.
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• W4220890103 creator A5074073109 @default.
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• W4220890103 creator A5086794868 @default.
• W4220890103 date "2022-07-01" @default.
• W4220890103 modified "2023-10-10" @default.
• W4220890103 title "Seasonal variability of nitroaromatic compounds in ambient aerosols: Mass size distribution, possible sources and contribution to water-soluble brown carbon light absorption" @default.
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• W4220890103 doi "https://doi.org/10.1016/j.chemosphere.2022.134381" @default.
• W4220890103 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35318013" @default.
• W4220890103 hasPublicationYear "2022" @default.
• W4220890103 type Work @default.
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• W4220890103 hasAuthorship W4220890103A5028145036 @default.
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• W4220890103 hasAuthorship W4220890103A5073906407 @default.

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