AN X-RAY DIFFRACTION STUDY OF HUMIC ACIDS

概要

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A, Rp and P type humic acids and certain related materials were subjected to X-ray diffraction analysis. In general, the soil humic acids exhibited γ- and (002)-bands. A and Rp type humic acids showed (002)- and γ-bands, respectively. P type humic acid exhibited γ- and (002)-bands, with the former predominating with regard to the latter. The (002)-band of A type humic acids was further analyzed using the Fourier transformation method. The number of layers stacked parallel to each other was 9 on the average. The most commonly found stacking units consisted of 2 and 3 layers. The average maximum number of layers per stack was 2.66. The weight percent of stack per humic acid was up to 32. In the case of Sochicken-1 humic acid (A type) extracted from Kuroboku soil, the presence of layer stacking was confirmed by transmission electron microscopy. Based on these results, the structure of humic acids is discussed.
社団法人日本土壌肥料学会の論文