CHEMICAL STUDIES ON SOIL HUMIC ACIDS : VII. pH-Dependent Nature of the Ultraviolet and Visible Absorption Spectra of Humic Acids
スポンサーリンク
概要
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The pH-dependent nature of the ultraviolet and visible absorption spectra of 39 humic acids (HAs) was investigated. Two kinds of difference absorbance, ΔE(pH 12.4-7) and ΔE(pH 7-3.5), were compared for these HAs and related substances, and their characteristics are discussed. The wavelengths at the peaks of ΔE(pH 12.4-7) were common to Rp type HAs and the milled wood lignin of rice straw, but not to A type HAs. The ΔE(pH 12.4-7) values of HAs at 600 nm had no linear correlation with the phenol contents but these were approximately proportional to the absorbance of HAs at 6OO nm. This result suggests that the ΔE(pH 12.4-7) of HAs at 600 nm does not depend on the phenolic content but on the amount of conjugate systems in HAs. The ΔE(pH7-3.5) of HAs at 285 and 360 nm increased linearly with increasing absorbance at 285 and 360 nm. The chemical structures in HAs responsible for the change in absorbance with change in pH from 3.5 to 7 was presumed to increase with increasing degree of humification.
- 社団法人日本土壌肥料学会の論文
著者
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Kuwatsuka Shozo
Faculty Of Agriculture Nagoya University
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Tsutsuki Kiyoshi
Faculty Of Agriculture Nagoya University
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