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United States Department of Agriculture

Agricultural Research Service

Title: Humic Substances (Hs) in the Ao and Bh Horizons on Podzols

Authors
item Simpson, Andre - UNIV. OF BIRMINGHAM, ENG
item Kingery, William - MISS STATE UNIV. MS
item Hayes, Michael - UNIV OF BIRMINGHAM, ENG
item Clapp, Charles
item Watt, Barbara - UNIV OF BIRMINGHAM, ENG

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: September 1, 1997
Publication Date: N/A

Technical Abstract: Using the solvent sequence, water, neutral pyrophosphate (Pyro), Pyro pH 10.6, Pyro + NaOH, and resins in tandem, HS from the Ao and Ah horizons of a forested podzol, and from a neighbouring (Ah horizon) deforested podzol were isolated and fractionated. Analyses, using 1H- and 13C-NMR, FT-IR and fluorescence spectroscopy, elemental, sugar and amino acid analyses, various derivitization and degradation procedures, delta **13C and delta **15N, and titration data have shed new light on the similarities and differences between the various HS fractions. Results from relatively new two-dimensional NMR are very promising with regard to identifications of component molecules and, in combination with classical and modern physico- chemical procedures, can be expected to significantly advance awareness of structures.

Last Modified: 11/24/2014
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