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Structural Characterization of Soil Organic Matter and Humic Acids in Particle-Size Fractions of an Agricultural Soil

^a Dep. of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
^b Environmental Science Graduate Program, The Ohio State Univ., 100 W 18th Ave., Columbus, OH 43210

View larger version (45K): [in a new window]   Fig. 1. Tetramethylammonium hydroxide (TMAH) thermochemolysis-GC/MS chromatograms of (a)>250 µm, and (b) <2 µm soil aggregate-size fractions. For peak identification see Table 2.

View larger version (29K): [in a new window]   Fig. 2. Cross polarization magic angle spinning (CPMAS) 13C nuclear magnetic resonance (NMR) spectra of humic acids (HAs) from different aggregate-size fractions.

View larger version (35K): [in a new window]   Fig. 3. Tetramethylammonium hydroxide (TMAH) thermochemolysis-GC/MS chromatograms of humic acids (HAs) from (a) >250 µm, and (b) <2 µm soil aggregate-size fractions. For peak identification see Table 2.

View larger version (35K): [in a new window]   Fig. 4. Pyrolysis-GC/MS chromatograms of humic acids (HAs) from (a) >250 µm, and (b) <2 µm soil aggregate-size fractions. For peak identification see Table 3.

View larger version (30K): [in a new window]   Fig. 5. Tetramethylammonium hydroxide (TMAH) thermochemolysis-GC/MS selective ion chromatogram (74 m/z) of humic acids (HAs) from <2 µm soil aggregate-size fraction (FAME, fatty acid methyl ester; DAME, dicarboxylic acid dimethyl ester).