Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 48, Issue 13, Pages 7461-7468Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es5015423
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Funding
- U.S. National Science Foundation [NSF 1044610]
- RFBR [13-04-0185313]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1107774] Funding Source: National Science Foundation
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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 H-1 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. H-1 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.
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