アミノカルボン酸を配位子とするキレート樹脂の高機能化設計 [in Japanese] Design for Functionalization of Chelating Resins Having Aminocarboxylic Acids as Ligands [in Japanese]
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The design factors for chelating resins were evaluated in detail using a chromatographic method to improve the complexation abilities, the adsorption/desorption equilibrium and element selectivities on chelating resins. The adsorption properties on the chelating resins were drastically improved by adopting a hydrophilic base matrix and a spacer arm. A good correlation was obtained between the retention factors of rare-earth elements and the stability constants of the ligand on the chelating group immobilized. In consideration of these results, novel polyaminocarboxylic acid-type chelating resins were designed. They were synthesized by partial carboxymethylation of oligo-/polyethyleneimine that was immobilized onto the hydrophilic base matrix. Further, an unique element exclusion mechanism was added by introducing positive sites into the ligands. Consequently, the adsorption pH range was expanded by introducing ligands having a multidentate ligand, and alkaline and alkaline earth elements were scarcely retained. On the other hand, the recoveries under acidic conditions for molybdenum and vanadium, which form oxo-acid in water, were reinforced by the ion-exchange interaction with the positive site. These chelating resins were applied to the solid-phase extraction of trace metal elements in environmental water and biological fluid, and the target metal elements could be effectively extracted without any interferences of coexisting elements, such as alkaline and alkaline earth elements. Furthermore, chelate fiber was developed by a wet-spining method mixed with rayon and a macromolecule polyaminocarboxylic acid compound. However, despite the mixed spining into rayon, the element adsorption characteristics on the polyaminocarboxylic acid-type chelating fiber mentioned above was completely preserved. These chelating materials having unique element adsorption characteristics in this studies will contribute to improving of the measurement accuracy and precision in the element analyses.
- BUNSEKI KAGAKU
BUNSEKI KAGAKU 64(11), 811-819, 2015
The Japan Society for Analytical Chemistry