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Characterization of Organic Matter in Soils by Thermochemolysis Using Tetramethylammonium Hydroxide (TMAH)

^a Dep. of Chemistry, Ohio State Univ., 100 W. 18th Ave. Columbus, OH 43210 USA
^b Dep. of Soil and Water Sciences, Faculty of Agriculture, Food and Environ. Qual. Sci., Rehovot P.O.B. 12 Israel 76100
^c USDA–ARS, Univ. of Minnesota, St. Paul, MN 55108 USA

View larger version (26K): [in a new window]   Fig. 1 (A) Tetramethylammonium hydroxide (TMAH) thermochemolysis–gas chromatography/mass spectrometry chromatogram of 0- to 7.5-cm soil layer, and (B) 7.5–15 cm soil layer. For peak identification refer to Table 1

View larger version (24K): [in a new window]   Fig. 2 (A) Tetramethylammonium hydroxide (TMAH) thermochemolysis–gas chromatography/mass spectrometry chromatogram of 15–30 cm soil layer, and (B) 30–45 cm soil layer. For peak identification refer to Table 1

View larger version (12K): [in a new window]   Fig. 3 Syringyl to guaiacyl ratio (S/G) as calculated from the tetramethylammonium hydroxide (TMAH) thermochemolysis–gas chromatography/mass spectrometry chromatograms vs. soil depth

View larger version (17K): [in a new window]   Fig. 4 Cross polarization magic angle spinning (CPMAS) 13C-nuclear magnetic resonance (NMR) spectra of the soil layers at (A) 0–7.5 cm, (B) 7.5–15 cm, (C) 15–30 cm, and (D) 30–45 cm