CHEMICAL AND BIOLOGICAL STUDIES ON ENVIRONMENTAL HUMIC ACIDS : II. ^1H-NMR and IR Spectra of Humic Acids
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概要
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Forty humic acids from various types of soils were examined by ^1H nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy. The ^1H-NMR spectra were characterized by peaks which were attributed to aromatic, lactone, methoxyl, and aliphatic protons α, β, and γ to aromatic carbon rings. Andisol humic acid showed high percentages of aromatic protons and low percentages of aliphatic and methoxyl protons. Sediment and Inceptisol humic acids showed low aromatic proton and high aliphatic proton percentages. Based on the relationships between the H/C ratio and various proton percentages, it was found the with the progression of humification, aliphatic side chain and methoxyl groups split off, and condensed aromatic rings were introduced into the humic molecules. The characteristic absorption of lignin appeared in the IR spectra of Entisol, and Inceptisol humic acids. Entisol, Oxisol, and sediment humic accids showed a strong absorption arising from peptides. Andisol humic acid showed no evidence of the presence of a lignin moiety or peptide linkages.
- 社団法人日本土壌肥料学会の論文
著者
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Yonebayashi Koyo
Faculty of Agriculture, Kyoto Prefectural Unirersity
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Hattori Tomoo
Faculty of Agriculture, Kyoto Prefectural University
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Hattori Tomoo
Faculty Of Agriculture Kyoto Prefectural University
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Yonebayashi Koyo
Faculty Of Agriculture Kyoto Prefectural University
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