Interaction between aluminium ions and organic ligands in acidified hydrosphere of ecosystem

生态系统酸化水圈中铝离子与有机配体的相互作用

• 批准号: 08680579
• 负责人: YOKOYAMA Takushi
• 金额: $ 0.51万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08680579/
• 关键词: Aluminium; Toxicity; Acid rain; Acidification of soil; Hydrosphere; Humic acid; Fulvic acid; Functional group; 植物毒; アルミニウムイオン; カルボキシル基; フェノール性水酸基; アルミニウム-フルボ酸錯体

The acid precipitates have been acidyfying soil. The acidification can make aluminium in soils dissolve in hydrosphere such as soil water, groundwater, river water, lake water etc., of the buffer capacity for acid exceeds a certain limit. When present in high amount, aqua aluminium ion exhibits toxic effects against plants. The species that have generally been considered more toxic are the monomers such as Al(H_2O)_6^<3+>, Al(H_2O)_5OH^<2+> and Al(H_2O)_4(OH)_2^+. However, aluminium complexes with organic ligands are less phtotoxic than the aquaaluminium ion and its hydrolytic products. Therefore, a detailed understanding of the aluminium binding properties of organic ligands has particularimportance for umderstanding the phytotoxicity of aluminium.In this study, the interaction between aluminium ion and some organic ligands (iminodiacetic acid, quinolic acid, tiron, salicylic acid, phthalic acid, chelex-100 and Bio-Rad cation exchange resins) ware investigated by ^<13>C and ^<27>Al NMR.It was found that the complex formation for aluminium ion with the organic ligands under acidic conditions strongly depended on the chelate effect. In other words, monodatate complexes were not formed but chelate complexes were preferably formed. Moreover, the stability of the chelate complexes was in order 5>6>7 membered rings.

酸性沉淀物使土壤酸化。酸化可使土壤中的铝溶解于土壤水、地下水、河水、湖水等水圈中，对酸的缓冲能力超过一定限度。当大量存在时，水铝离子对植物表现出毒性作用。通常被认为毒性较大的物质是单体，例如 Al(H_2O)_6^<3+>、Al(H_2O)_5OH^<2+> 和 Al(H_2O)_4(OH)_2^+。然而，具有有机配体的铝络合物的光毒性低于水铝离子及其水解产物。因此，详细了解有机配体的铝结合特性对于了解铝的植物毒性具有特别重要的意义。在本研究中，铝离子与一些有机配体（亚氨基二乙酸、喹啉酸、钛试剂、水杨酸、邻苯二甲酸、 chelex-100和Bio-Rad阳离子交换树脂)通过^ 13 C和^ 27 Al NMR研究。发现酸性条件下铝离子与有机配体形成络合物强烈依赖于螯合效应。即，未形成单数据酸络合物，但优选形成螯合络合物。此外，螯合物的稳定性顺序为5>6>7元环。

项目成果

広城吉成他: "農地利用形態の変化に伴う地下水中硝酸態窒素濃度及び溶存酸素量の変化" 地下水学会誌. 38. 1-11 (1996)

Yoshinari Hiroki等人：“农业用地变化引起的地下水硝酸盐氮浓度和溶解氧量的变化”日本地下水水文学会杂志38. 1-11 (1996)。

Yoshinari Hiroshiro: "Cation transport in undisturbed soil with spatial distribution of cation exchange capacity" Dobokugaku-Ronbunshu. No.579. 15-27 (1997)

Yoshinari Hiroshiro：“原状土壤中的阳离子传输与阳离子交换能力的空间分布”Dobokugaku-Ronbunshu。

広城 吉成: "陽イオン交換容量の空間分布を考慮した不撹乱土壌中" 土木学会論文集. No.579. 15-27 (1997)

Yoshinari Hiroki：“考虑原状土壤中阳离子交换能力的空间分布”，日本土木工程师学会会议记录，第 579 期（1997 年）。

Takushi Yokoyama: "^Al and ^P NMR study on the formation of Al-NTA-(Phosphate)^n(n=1 or 2) complexes im aqueous solution" Analytical Science. (in press). (1998)

Takushi Yokoyama：“在水溶液中形成Al-NTA-(磷酸盐)^n(n=1或2)络合物的^ 27 Al和^ 31 P NMR研究”分析科学。

広城吉成: "陽イオン交換容量の空間分布を考慮した不撹乱土壌中の陽イオン輸送解析" 土木学会論文集. No.579. 15-27 (1997)

Yoshinari Hiroki：“考虑阳离子交换能力的空间分布的原状土壤中的阳离子传输分析”日本土木工程师学会第 579 号（1997 年）。