AROMATIC CONSTITUENTS OF HUMIC ACIDS RELEASED BY Na-AMALGAM REDUCTIVE CLEAVAGE, KOH FUSION AND ZINC DUST FUSION
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概要
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Eight humic acids showing different degree of humification were treated with HC1 (1 : 1). The hydrolyzed humic acids were subjected to reductive cleavage with Na-amalgam, KOH fusion and zinc dust fusion. The yields of degradation products were determined by colorimetry and gas chromatography. The experimental results were summarized as follows : 1. The amounts of ether-soluble substances obtained by reductive cleavage with Na-amalgam ranged from 21.6% for Kuragari (A type) to 7.8% for Kisokoma B_2 (Rp type). The yields of phenolic substances expressed in terms of vanillic acid content ranged from 3.0% for Kuragari (A type) to 1.8% for Kisokoma B_2 (Rp type). Resorcinol, p-hydroxybenzoic acid, vanillic acid, protocatechuic acid and syringic acid were detected in the gas chromatograms of the ether-soluble substances and their total yield comprised less than 0.6% of the Kisokoma F(Rp type). 2. The KOH fusion of humic acid yielded a larger amount of degradation products as compared to reductive cleavage. The amounts of ether-soluble substances ranged from 42.7% for Kisokoma F(Rp type) to 12.6% for Sochiken 1(A type). The yields of phenolic substances, expressed in terms of amount of protocatechuic acid, ranged from 10.6% for Kisokoma F(Rp type) to 4.6% for Inogashira(A type). Except for syringic acid, the same compounds released after reductive cleavage were detected in the gas chromatograms. The total yields of phenolic compounds ranged from 2.1% for Sochiken 2(B type) to 0.4% for Sochiken 1(A type). 3 The amounts of benzene-soluble substances and hydrocarbons obtained from Goshikigahara (P type) by zinc dust fusion were 20.9% and 5.2%, respectively. The yields of the hydrocarbons tended to increase in the order; P type>Rp type≧B type>A type. Perylene and 2-methylanthracene were detected in the gas chromatograms of the hydrocarbon fractions and, in the case of Goshikigahara (P type), their yields were 0.031% and 0.010%, respectively.
- 社団法人日本土壌肥料学会の論文
著者
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Kumada Kyoichi
Faculty Of Agriculture And Water Research Institute Nagoya University
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Matsui Yoshio
Faculty Of Agriculture Nagoya University
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