Analyses of Migration Behavior of Heavy Metal Ions in Soil Sphere

土壤球中重金属离子迁移行为分析

• 批准号: 12680522
• 负责人: MIYAJIMA Tohru
• 金额: $ 2.18万
• 依托单位: Saga University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12680522/
• 关键词: Fulvic acid; Humic acid; Silica; Heavy metals; Water Pollution; Adsorption; Complexation; Equilibria

Fulvic acid(FA) and Humic acid(HA) have been extracted from standard soil samples. In addition, chemically bonded humic acid(CBHA) with silica was prepared. Both polyelectrolytic nature and heterogeneity nature of the FA, HA, and CBHA samples have been evaluated according to pH titration procedure. It has been clarified that 1) HA and CBHA samples mainly contain carboxylic acids with pKa > 4, whereas most of the carboxylic acids of FA show pKa<2, and 2) the time required for equilibration of HA and CBHA is much longer than FA, probably due to aggregation formation in aqueous solution. The hydrophobic nature of HA backbone is expected to be the main reason for the aggregation formation, which seems worth further study. Complexation equilibria of FA samples as well as CBHA samples have been analyzed based on Gibbs-Donnan model. Elution behavior of heavy metal ions on a cation-exchanger column has been monitored in the presence of FA and/or HA. The elution profile obtained by the column experiment reflects the migration profile of heavy metal ions in natural water/soil systems.

从标准的土壤样品中提取了富毒酸（FA）和腐殖酸（HA）。此外，制备了化学键合的腐殖酸（CBHA）。 FA，HA和CBHA样品的聚电解性质和异质性性质均已根据PH滴定程序进行了评估。已经澄清的是，1）HA和CBHA样品主要含有PKA> 4的羧酸，而FA的大多数羧酸均显示PKA <2，而2）HA和CBHA平衡所需的时间比FA更长，可能是由于在水性溶液中聚集的。 HA主链的疏水性有望成为聚集形成的主要原因，这似乎值得进一步研究。基于Gibbs-Donnan模型，已经分析了FA样品和CBHA样品的络合平衡。在FA和/或HA的存在下，已监测了重金属离子在阳离子交换柱上的洗脱行为。通过柱实验获得的洗脱剖面反映了天然水/土壤系统中重金属离子的迁移曲线。

项目成果

H. Kodama, T. Miyajima, H. Tabuchi, and S. Ishiguro: "A Calorimetric Study on the Acid dissociation of the Conjugate Acids of Poly (N-vinylimidazole) and Polyallylamine"Colloid & Polymer Science. Vol.278. 1-7 (2000)

H. Kodama、T. Miyajima、H. Tabuchi 和 S. Ishiguro：“聚（N-乙烯基咪唑）和聚烯丙胺共轭酸的酸解离量热研究”胶体

T.Miyajima: "Adsorption of Some Metal Ions and Mineral Acids on Chitin"Chitin and Chitosan Research. 2・7. 61-68 (2001)

T.Miyajima：“甲壳素上的一些金属离子和无机酸的吸附”甲壳素和壳聚糖研究2・7（2001）。

H.Kodama: "A calorimetric study of the acid-dissociation of the conjugate acids of poly(N-vinilimidazole) and polyallylamine"Colloid and Polymer Science. 278. 1-7 (2000)

H.Kodama：“聚（N-乙烯基咪唑）和聚烯丙胺的共轭酸的酸解离量热研究”胶体与聚合物科学。

H. Maki, M. Tsuji, H. Nariai, M. Watanabe, M. Sakurai, and T. Miyajima: "A ^9Be NMR Study on the Coordination Structures of Be^<2+> Complexes with Cyclo-μ-Imidotriphosphate Anions(I)"Phosphorus Research Bulletin. Vol.12. 155-160 (2001)

H. Maki、M. Tsuji、H. Nariai、M. Watanabe、M. Sakurai 和 T. Miyajima：“Be^<2+> 与环-μ-亚胺三磷酸阴离子配合物配位结构的 ^9Be NMR 研究(I)《磷研究通报》. Vol.12. 155-160 (2001)

K.N. Ghimire, K. Inoue, T. Miyajima, K. Yoshizuka, and T. Shoji: "Adsorption of Some Metal Ions and Mineral Acids on Chitin"Chitin and Chitosan Research. Vol.2, No.7. 61-68 (2001)

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