著者

進藤 晴夫 平舘 俊太郎 本間 洋美

出版者

一般社団法人日本土壌肥料学会

雑誌

日本土壌肥料學雜誌 (ISSN:00290610)

巻号頁・発行日

vol.70, no.6, pp.769-774, 1999-12-05

被引用文献数

4

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山焼き後の植物炭化物から希硝酸処理後に得られた腐植酸(C-HA)と黒ボク土のA層から得られた腐植酸(S-HA)の分光学的性質(紫外・可視・赤外吸収スペクトル, ^<13>C-NMRスペクトル)および物理化学的性質(腐植化度,元素組成,X線回折図)を比較した。 1)C-HAおよびSHAの紫外・可視吸光曲線は,両者とも特異的な吸収を持たず,滑らかであった。また,これらの腐楯酸はA型に分類された。 2)炭素および水素含量はC-HAとS-HAの間でほとんど差が認められないが,窒素含量はC-HAの方がはるかに高い値を示し,一方,酸素含量はS-HAの方がいくらか高い値を示した。原子数比[H]/[C]は両腐植酸の間でほぼ同じ値を示すが,[0]/[C]および[0]/[H]はS-HAの方が高い値を示した。C-HAのこれらの分析値は,窒素含量を除き,黒ボク土のA型腐植酸に対して報告された既往の分析値の範囲内に分布した。 3)^<13>C-NMRスペクトルによると,C-HAとS-HA両者ともに芳香族炭素>カルボニル炭素>炭水化物炭素≒脂肪族炭素の順であった。また,芳香族炭素とカルボニル炭素は,S-HAの方がC-HAに比べていくらか高い割合を示すが,炭水化物炭素と脂肪族炭素に対しては,逆の関係が示された。 4)C-HAとS-HAのIRスペクトルは,互いによく類似していた。 5)C-HAおよびS-HAのXRD図は,両者がグラファイト様の積層構造を有することを示した。

著者

臼井 恵次 進藤 晴夫 丸本 卓哉 岸野 拓男

出版者

日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.17, no.9, pp.596-599, 1994

被引用文献数

2 1

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A release of phosphorus from calcium phosphate, iron(III) phosphate, and aluminum phosphate owing to the complex formation of their metals with fulvic acid was examined. Fulvic acid was extracted from lake sediments and treated with Amberlite XAD-8 resin. The non-adsorbed fraction of fulvic acid on the resin, which has highly Cu2+-complexing capacity, was used in this study, because the adsorbed fraction has only little Cu2+-complexing capacity as reported in our previous paper. The non-adsorbed fraction was able to release phosphorus from calcium phosphate, but not from iron(III) phosphate, and aluminum phosphate. The application of X-ray analysis to the calcium phosphate indicated that the major component is hydroxyapatite. The stability constant of the Cu2+-fractionated fulvic acid was determined to be 2×10(5) (log K=5.3) and the average molecular weight of the fulvic acid was 1,026.

著者

臼井 恵次 岸野 拓男 東 俊雄 進藤 晴夫 丸本 卓哉

出版者

日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.16, no.10, pp.690-695, 1993

被引用文献数

3 3

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Fulvic acid extracted from lake sediments was treated with Amberlite XAD-2 and XAD-8 resins. The metal complexing ability of the fulvic acid was measured at pH 6.0 with a Cu2+ titration method, in which free Cu2+ was determined with an ion selective electrode. A two binding site model, in which there are two kinds of the molecules having strong and weak complexing ability and they complex with metal ion at the ratio of 1:1, was employed for the determination of the stability constant and complexing capacity of the fulvic acid, because the hyperbolic approxmation could apply to the Scatchard plot of the found values. The stability constants of the fulvic acids having strong complexing ability and weak complexing ability were in the range of 6.33-7.12 and 4.35-4.66, respectively. Both colorless fractions of the fulvic acid which were not adsorbed on XAD-2 and XAD-8 resins had such a high complexing ability as 44 and 32 μmol・g-1, respectively. On the other hand, both colored fractions of the fulvic acid which were adsobed on the resins had only little complexing capacity.

著者

臼井 恵次 進藤 晴夫 丸本 卓哉 岸野 拓男

出版者

公益社団法人 日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.17, no.9, pp.596-599, 1994-09-10 (Released:2008-01-22)

参考文献数

13

被引用文献数

2 1

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A release of phosphorus from calcium phosphate, iron(III) phosphate, and aluminum phosphate owing to the complex formation of their metals with fulvic acid was examined. Fulvic acid was extracted from lake sediments and treated with Amberlite XAD-8 resin. The non-adsorbed fraction of fulvic acid on the resin, which has highly Cu2+-complexing capacity, was used in this study, because the adsorbed fraction has only little Cu2+-complexing capacity as reported in our previous paper.The non-adsorbed fraction was able to release phosphorus from calcium phosphate, but not from iron(III) phosphate, and aluminum phosphate. The application of X-ray analysis to the calcium phosphate indicated that the major component is hydroxyapatite. The stability constant of the Cu2+-fractionated fulvic acid was determined to be 2×105 (log K=5.3) and the average molecular weight of the fulvic acid was 1,026.

著者

臼井 恵次 岸野 拓男 東 俊雄 進藤 晴夫 丸本 卓哉

出版者

公益社団法人 日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.16, no.10, pp.690-695, 1993-10-10 (Released:2008-04-21)

参考文献数

19

被引用文献数

5 3

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Fulvic acid extracted from lake sediments was treated with Amberlite XAD-2 and XAD-8 resins. The metal complexing ability of the fulvic acid was measured at pH 6.0 with a Cu2+ titration method, in which free Cu2+ was determined with an ion selective electrode. A two binding site model, in which there are two kinds of the molecules having strong and weak complexing ability and they complex with metal ion at the ratio of 1 : 1, was employed for the determination of the stability constant and complexing capacity of the fulvic acid, because the hyperbolic approxmation could apply to the Scatchard plot of the found values.The stability constants of the fulvic acids having strong complexing ability and weak complexing ability were in the range of 6.33-7.12 and 4.35-4.66, respectively. Both colorless fractions of the fulvic acid which were not adsorbed on XAD-2 and XAD-8 resins had such a high complexing ability as 44 and 32 μmol·g-1, respectively.On the other hand, both colored fractions of the fulvic acid which were adsobed on the resins had only little complexing capacity.