Citation:
JIANG Yi-Fan, YU Wen-Juan, WANG Jiao-Jiao, KANG Hong-Zhang. Analysis of Chemical Composition of Soil Organic Matter Using Pyrolysis Gas Chromatography Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry,
;2020, 48(11): 1526-1534.
doi:
10.19756/j.issn.0253-3820.191630
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Soil organic matter (SOM) is an important part of soil, which plays an important role in soil fertility, water content and other properties. In this work, soil samples were collected from seven oriental oak sites at different depths along a latitudinal gradient in eastern China. The chemical composition of SOM of 84 samples was analyzed qualitatively and semi-quantitatively by direct injection pyrolysis gas chromatography/mass spectrometry (Py-GC/MS) and tetramethylammonium hydroxide derivatization pyrolysis gas chromatography/mass spectrometry (TMAH-Py-GC/MS), respectively. TMAH methanol solution (25%) was used for derivatization, and a DB-5ms (30 m×0.25 mm, 0.25 μm) column was selected for GC/MS analysis. A total of 261 and 117 biomarkers of SOM were identified by TMAH-Py-GC/MS and Py-GC/MS methods, respectively. The markers detected by the TMAH-Py-GC/MS method had more types and more diverse structures and included more numbers of lignin-derived and lipid-derived compounds. The contents of substances also varied with methods. The Py-GC/MS samples had higher proportions of polysaccharides (28%) and lipids (22%), while the TMAH-Py-GC/MS samples had higher contents of lipids (33%). The chromatographic retention times of alkanes, alkenes, and fatty acids all had good linear relationship with numbers of carbon atom (R2>0.95). The changes of contents of six groups with soil depth and latitude obtained by the two methods were compared.
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