Kichkiruk O. Application of aminomethylation reaction for immobilization of complexing analytical reagents on silica surface

3. The dissertation is devoted to elaboration of methods of synthesis of complexing silica adsorbents with anchorage of organic ligands via single-stage aminomethylation Mannich reaction and to application of obtained adsorbents for determination of microquantities of toxic metals in natural and waste waters. Single-stage method of immobilization of some important analytical reagents of phenolic type (8-hydroxyquinoline, 4-(2-pyridylazo)resorcinol, 1-(2-pyridylazo)-2-naphthol) with simultaneous proceeding of aminomethylation process and condensation of products of the Mannich reaction with silanol groups of the silica surface has been developed. Conditions of a single-stage method of chemical attachment of reagents to the surface of inorganic matrix using the Mannich aminomethylation reaction and adsorption properties towards ions of toxic metals of the chemically modified silicas obtained have been studied. Physicochemical characterization of the synthesized modified silicas was carried out by spectral and adsorption methods. Synthesized modified sorbents have been characterized by adsorption method, DRIFT and UV spectroscopies. Obtained materials are perspective for application in solid-phase extraction of metal ions. Method of synthesis provides high concentration and a more homogeneous distribution of complexing groups on the surface, the adsorbents obtained display a high capacity towards some environmentally toxic metals and satisfactory kinetic adsorption properties, which allow to use adsorbent for the ions preconcentration in the dynamic adsorption mode. Adsorption-X-ray fluorescence method for determination of some metal ions in nature and waste waters was elaborated.