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Structural Components of Humic Acids as Determined by Chemical Modifications and Carbon-13 NMR, Pyrolysis-, and Thermochemolysis-Gas Chromatography/Mass Spectrometry

Benny Chefetz^,*, Myrna J. Salloum, Ashish P. Deshmukh and Patrick G. Hatcher

Dep. of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, OH 43210

View larger version (23K): [in a new window]   Fig. 1. The 13C NMR spectra of the peat (left) and soil (right) humic acids (U, untreated; B, bleached; H, hydrolyzed).

View larger version (38K): [in a new window]   Fig. 2. Pyrolysis-GC/MS total ion current chromatograms of untreated (U), bleached (B), and hydrolyzed (H) soil humic acid (AL Cn: alkane/alkene; br: branched).

View larger version (44K): [in a new window]   Fig. 3. Pyrolysis-GC/MS total ion current chromatograms of untreated (U), bleached (B), and hydrolyzed (H) peat humic acid (AL Cn: alkane/alkene; br: branched).

View larger version (33K): [in a new window]   Fig. 4. Tetramethylammonium hydroxide (TMAH) thermochemolysis-GC/MS total ion current chromatograms of untreated (U), bleached (B), and hydrolyzed (H) soil humic acid (FAME, fatty acid methyl esters C no.; DAME, dicarboxylic acid dimethyl esters C no.; br., branched).

View larger version (39K): [in a new window]   Fig. 5. Tetramethylammonium hydroxide (TMAH) thermochemolysis-GC/MS total ion current chromatograms of untreated (U), bleached (B), and hydrolyzed (H) peat humic acid (FAME, fatty acid methyl esters C no.; DAME, dicarboxylic acid dimethyl esters C no.; br., branched; un., unsaturated).