Tsyukalo L. Ye. Phtalexons immobilized on silica surface - solid-phase reagents for sorption-spectroscopic and visual test-determination of Pb(II), Zn(II), F^- and C₂O₄^2-. – Manuscript.

The thesis for a Candidate’s degree in chemical science by speciality 02.00.02 – analytical chemistry. – Kyiv National Taras Shevchenko University, Kyiv, 2006.

The dissertation is devoted to the elaboration of the solid-phase reagents on the base of phtalexons (xylenol orange, methylthymol blue) and triphenylmethane colorant (eriochromcianine R) on functionalized by trinonyloctadecylamonium of iodine adsorptially loaded on the silica surface and to development on their base sorption-spectroscopic and visual test-determination of Pb(II), Zn(II), ZrOCl₂, F^- and C₂O₄^2-. The conditions of these reagents and its complexes with Fe(III), Bi(III) и Al(III) correspondently immobilization on silica have been optimized. New analytical forms of XO, MTB and ER with optimal for determination of determined elements chemical-analytical characteristics were optimized. The conditions of selective recovery of Pb(II), Zn(II), ZrOCl₂ using solid-phase phtalexons were determined. The methods of C₂O₄^2- and F^- determination were based on a competitive reactions of immobilized MTB and ZrOCl₂ with C₂O₄^2- or F^- in solution. The influence of foreign ions onto the recovery determined elements and onto the value of analytical signal were investigated. On the base of the investigation the sensitive and selective sorption-spectroscopic and visual test-methods for Pb(II), Zn(II), C₂O₄^2- and F^- determination. The procedures are simple, quick and cost-effective. The methods proposed were applied to the analysis of natural objects, biological liquids and food-stuffs.

Keywords: solid-phase reagents, chelate complexes, immobilization, solid-phase spectrophotometry, phtalexons, triphenylmethane colorant, Pb(II), Zn(II), ZrOCl₂, F^- і C₂O₄^2-.