title: Molecular mapping of sorbent selectivities with respect to isolation of Arctic dissolved organic matter as measured by Fourier transform mass spectrometry.
abstract: The objectives of this study were to identify molecular features characteristic to arctic DOM from the Kolyma River basin and to elucidate structural imprints induced by a choice of the sorption technique. To achieve this goal, DOM was isolated from the Kolyma River basin with a use of three nonionic sorbents: Amberlite XAD-8 resin, PPL- and C18 - SPE cartridges, and one anion exchanging resin-diethylaminoethyl (DEAE) -cellulose. The structural studies were conducted with a use of electrospray ionization Fourier Transform Ion Cyclotron Resonance (ESI FT-ICR) mass spectrometry and liquid state (1)H NMR spectroscopy. The DOM isolates obtained with a use of PPL and C18 cartridges were characterized with higher content of aliphatic compounds as compared to XAD-8 and DEAE-isolates. In total, for all arctic DOM isolates we observed predominance of hydrogen saturated compounds with high H/C values of identified formulas from FT-ICR MS data. (1)H NMR spectroscopy studies have confirmed this trend and revealed high contribution of alkyl-chain protons into the spectral density of the arctic DOM reaching 43% for PPL isolates.
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University , Leninskie gory 1-3, 119991 Moscow, Russia.
authors.forename: Irina V
authors.initials: IV
authors.lastname: Perminova
authors.forename: Ivan V
authors.initials: IV
authors.lastname: Dubinenkov
authors.forename: Alexey S
authors.initials: AS
authors.lastname: Kononikhin
authors.forename: Andrey I
authors.initials: AI
authors.lastname: Konstantinov
authors.forename: Alexander Ya
authors.initials: AY
authors.lastname: Zherebker
authors.forename: Mantsa A
authors.initials: MA
authors.lastname: Andzhushev
authors.forename: Vasiliy A
authors.initials: VA
authors.lastname: Lebedev
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Bulygina
authors.forename: Robert Max
authors.initials: RM
authors.lastname: Holmes
authors.forename: Yury I
authors.initials: YI
authors.lastname: Kostyukevich
authors.forename: Igor A
authors.initials: IA
authors.lastname: Popov
authors.forename: Eugene N
authors.initials: EN
authors.lastname: Nikolaev
mesh_terms: D000327:Adsorption; D001110:Arctic Regions; D017357:Cyclotrons; D005583:Fourier Analysis; D005843:Geography; D007477:Ions; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry / Q000379:methods*; D009930:Organic Chemicals / Q000737:chemistry* / Q000302:isolation & purification*; D045483:Rivers / Q000737:chemistry; D012995:Solubility
chemical_list: D007477:Ions; D009930:Organic Chemicals