腐植酸の形成に関する物理化学的研究(第4報) : 人工腐植酸について

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Some studies were made on the effect of addition of various nitrogen compounds on the formation of artificial humus from glucose, and on the absorption spectra of artificial humic acids prepared from glucose, hydroquinon and lignin. 1. Yields of humus from glucose treated with hydrochloric acid were much increased with the addition of urea, and somewhat less in the case of amino acids containing benzen ring and hydroxylamine. But the addition of ammonium salts and aliphatic amino acids seemed to be indifferent to the yield. A greater part of nitrogen of urea added to the solution of glucose was found in the composition of artificial humus (Table 1). 2. The absorption spectra of artificial humic acids, alkali-soluble part of humus, were almost similar to those of soil humic acids, but essentially not. All of artificial humic acids from glucose, by treating with hydrochloric acid or sodium hydroxyde, were brought to show quite similar absorption curves, but those obtained by treating with sulfuric acid gave quite different curves in ultraviolet region. The absorption curves of humic acids prepared from hydroquinon by treating with sodium hydroxyd were apparently different from those frome glucose (Table 5 and Fig. l). 3. Light absorption of alkali lignin, when treated by boiling HCl (1 : 1), increased its intensity especially in the visible region, and the inclination of the absorption curve decreased with the length of treatment (Fig. l). 4. Existence of nitrogen in these artificial humic acids caused no apparent changes in their absorption spectra.
社団法人日本土壌肥料学会の論文
1955-06-05

腐植酸の形成に関する物理化学的研究(第4報) : 人工腐植酸について

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