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13 C NMR characterization of humic acids from soils of a development sequence
Author(s) -
NEWMAN R. H.,
TATE K. R.
Publication year - 1991
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1991.tb00089.x
Subject(s) - chemistry , soil water , carbon 13 nmr , environmental chemistry , humic acid , nmr spectra database , organic chemistry , spectral line , geology , soil science , fertilizer , physics , astronomy
SUMMARY Humic acids were isolated from nine topsoils in New Zealand tussock grasslands. Cross‐polarization 13 C NMR spectra of solid samples were used to estimate fractions of carbon contained in different types of chemical functional groups. The degree of oxygen substitution of aromatic rings showed a strong negative correlation with soil development. Aromaticities greater than 0.25 were found in humic acids from only the two least‐developed soils.