Advanced solid-state NMR characterization of marine dissolved organic matter isolated using the coupled reverse osmosis/electrodialysis method

Environmental Science & Technology
JingDong MaoE Michael Perdue

Abstract

Advanced (13)C solid-state techniques were employed to investigate the major structural characteristics of two surface-seawater dissolved organic matter (DOM) samples isolated using the novel coupled reverse osmosis/electrodialysis method. The NMR techniques included quantitative (13)C direct polarization/magic angle spinning (DP/MAS) and DP/MAS with recoupled dipolar dephasing, (13)C cross-polarization/total sideband suppression (CP/TOSS), (13)C chemical shift anisotropy filter, CH, CH(2), and CH(n) selection, two-dimensional (1)H-(13)C heteronuclear correlation NMR (2D HETCOR), 2D HETCOR combined with dipolar dephasing, and (15)N cross-polarization/magic angle spinning (CP/MAS). The two samples (Coastal and Marine DOM) were collected at the mouth of the Ogeechee River and in the Gulf Stream, respectively. The NMR results indicated that they were structurally distinct. Coastal DOM contained significantly more aromatic and carbonyl carbons whereas Marine DOM was markedly enriched in alkoxy carbon (e.g., carbohydrate-like moieties). Both samples contained significant amide N, but Coastal DOM had nitrogen bonded to aromatic carbons. Our dipolar-dephased spectra indicated that a large fraction of alkoxy carbons were not protonated...Continue Reading

References

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Citations

Mar 10, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Tung-Yi WuYi-Chiang Hsu
Jan 3, 2015·Environmental Pollution·Dainan ZhangKlaus Schmidt-Rohr
Jul 13, 2014·Marine Pollution Bulletin·Yulong ZhangJingdong Mao
Aug 21, 2015·Environmental Science. Processes & Impacts·Sara SandronBrett Paull
Dec 23, 2017·Environmental Science and Pollution Research International·Nan ZhaoJianWen Yang
Mar 29, 2014·Environmental Science. Processes & Impacts·Elizabeth C MinorAlan R Oyler
Feb 7, 2018·Progress in Nuclear Magnetic Resonance Spectroscopy·Jun KikuchiYasuhiro Date
May 30, 2017·Progress in Nuclear Magnetic Resonance Spectroscopy·Jingdong MaoKlaus Schmidt-Rohr
May 15, 2015·Environmental Science & Technology·Takanori KomatsuJun Kikuchi
Jan 25, 2018·Environmental Science & Technology·Xiaoyan CaoKlaus Schmidt-Rohr
Jul 2, 2019·Journal of Agricultural and Food Chemistry·Jisheng XuWenxue Wei

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