山焼き後の炭化物を希硝酸処理して得られた腐植酸とA型土壌腐植酸の分光学的および物理化学的諸性質における類似性

Translated title of the contribution: Similarities in Spectroscopic and Physicochemical Properties of Humic Acids from Charred Grassland Plants Treated with dil. HNO_3 after Prescribed Burning and from A Horizon of Kurobokudo (Ando Soils)

進藤 晴夫, 平舘 俊太郎, 本間 洋美

Research output: Contribution to journalArticlepeer-review

Abstract

We compared the spectroscopic and physicochemical properties of the humic acids isolated from charred grassland plants after HNO_3 treatment (C-HA) and from the A horizon of Kuro- bokudo (S-HA). 1) The shapes of the absorption curves in the UV and visible regions of the C-HA and S-HA were featureless, and their humic acids belonged to the A-type. 2) The carbon and hydrogen contents of C-HA were almost the same as those of S-HA, while the nitrogen content of C-HA was much higher than that of S-HA and the oxygen content of C-HA was lower than that of S-HA. The atomic [O]/[C] and [O]/[H] ratios of C-HA were lower than those of S-HA. These analytical data of C-HA, except for the nitrogen content, fell within the ranges of those of A-type soil humic acids reported previously. 3) The ^<13>C-NMR spectra of C-HA and S-HA were similar to each other, and the values of their carbon species were in the order of aromatic-C ≫ carbonyl- C > carbohydrate-C≒aliphatic-C. The values of the aromatic-C and carbonyl-C were lower in C-HA than in S-HA. The reverse was true for carbohydrate-C and aliphatic-C. 4) The FT-IR spectrum of C-HA resembled that of S-HA. 5) The XRD patterns of C-HA and S-HA indicated that these humic acids had graphite-like structures.
Translated title of the contributionSimilarities in Spectroscopic and Physicochemical Properties of Humic Acids from Charred Grassland Plants Treated with dil. HNO_3 after Prescribed Burning and from A Horizon of Kurobokudo (Ando Soils)
Original languageJapanese
Pages (from-to)769-774
Number of pages6
Journal日本土壌肥料学雑誌 = Japanese journal of soil science and plant nutrition
Volume70
Issue number6
Publication statusPublished - Dec 5 1999

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