Natural organic matter contained in clay rock pore water: Direct quantification at the molecular level using electrospray ionization mass spectrometry

Huclier‐Markai, Sandrine; Monteau, Fabrice; Fernández, Ana María; Vinsot, Agnès; Grambow, Bernd

doi:10.1002/rcm.8175

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…Visualization analysis of the ultrahigh‐resolution FT‐ICR MS mass spectra of fogwater DOM were done by using van Krevelen diagrams, double‐bond equivalent (DBE), aromaticity equivalent ( X c ) and carbon oxidation state (OS C ) (Huclier‐Markai et al., 2018; Jimenez‐Morillo et al., 2018). DBE was mainly used to calculate the degree of saturation of compounds and OS C was used to describe the composition of complex organic compounds in the oxidation process (Kourtchev et al., 2016; Kroll et al., 2011).…”

Section: Methodsmentioning

confidence: 99%

Unsaturated Fatty Acids Enhance Aqueous Atmospheric Oxidation Ability by Producing Oxygen‐Containing Radicals in Fog Droplets

et al. 2023

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The surface of atmospheric aqueous aerosol is covered with an organic film. However, there have been limited studies about the photochemical process between the organic coating and aqueous samples such as fogwater, which contains light absorbing brown carbon (BrC). Here, the interactional aging process between unsaturated fatty acids and aqueous samples was performed by laboratory studies and field observations. On the one hand, glycine and alanine were selected as organic nitrogen‐containing compounds to form BrC with carbonyl compounds like glyoxal or methylglyoxal. Oleic acid was induced to form organic peroxy radicals through H‐abstraction by the excited triplet BrC or hydroxyl radical (OH). On the other hand, one type of aqueous formation pathway of Criegee intermediates (CIs) was proposed through the oxidation of oleic acid. CIs may be formed by OH addition to C=C bonds and scavenged by interfacial reactions. Results from ultra‐high resolution Fourier transform ion cyclotron resonance mass spectrometry show that the synergistic effect of oleic acid and OH may have a higher oxidative capacity than OH. Furthermore, our study demonstrates that oleic acid can improve the aqueous oxidation ability by producing oxygen‐containing radicals. These findings highlight that the formation of free radicals is greatly influenced by photochemical reactions, which further reveal the complexities of fog organic chemistry.

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