Mathematics – Logic
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..125h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 1, pp.125-130
Mathematics
Logic
3
Scientific paper
Dipolar dephasing 13 C NMR studies of three highly aromatic humic acids, one from a modern soil and two from paleosols, have permitted the determination of the degree of aromatic substitution. From these data and the normal solid-state 13 C NMR data we have been able to develop a model for the average chemical structure of these humic acids that generally correlates well with permanganate oxidation data. The models depict these humic acids as benzene di- and tricarboxylic acids interconnected by biphenyl linkages. An increasing degree of substitution is observed with increasing geologic age. These structures may be characteristic of the resistant aromatic part of the "core" of humic substances that survives degradation.
Hatcher Patrick G.
Schnitzer Morris
Vassallo Anthony M.
Wilson Michael A.
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