Chinese Journal of Magnetic Resonance ›› 1998, Vol. 15 ›› Issue (5): 411-420.

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APPLICATION OF NEWLY-DEVELOPED 1H NMR TECHNIQUES TO THE STUDY OF HUMIC ACIDS

Wang Liming1, Mao Xi'an1, Yang Yuhui2   

  1. 1. Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071;
    2. Department of Chemical Engineering, University of Cambridge, Pembroke Street, CB2 3RA, Cambridge, UK
  • Received:1998-03-26 Revised:1998-04-23 Published:1998-10-05 Online:2018-01-17

Abstract: Some newly developed one and two dimensional 1H NMR techniques, including totally correlated spectroscopy (TOCSY), self-diffusion coefficient measurements and maximum quantum spectroscopy (MAXY), are applied to the study of a humic acid sample suspended or dissolved in D2O, NaOH/D2O and DM SO-d6.T OCSY experiments suggest that humic acids contain poly peptides that are soluble in DMSO but not in water, while the self-diffusion coefficient measurements suggest that in basic solution there are small molecules that are not included in the humic acid aggregates.From the MAXY spectra, detailed assignments for the proton resonances become possible.

Key words: Humicacids, 1H NMR, TOCSY, Self-diffusion measurement, MAXY spectral editing