Efimova I. 4-Sulfo-2(4'-sulfonaphthalene-1'-azo)-naphthol-1 as a redox-reagent for a photometric determination of several metal ions in the highest oxidation states

The dissertation is devoted to the study of chemical-analytical properties of 4-Sulfo-2(4'-sulfonaphthalene-1'-azo)-naphthol-1 (carmoazine - CAN) and of the products of its interaction with Hg(II), Mn(VII) and Ce(IV) ions in aqueous, aqueous-organic media and on a surface of woven materials (cotton, flax) by spectrophotometry, potentiometry and colorimetry methods. It has been shown CAN to be an efficient redox reagent for several metal ions in the highest oxidation states in the range of redox pairs potentials 0.90 ? 1.75 V. CAN ionization constants in aqueous and aqueous-organic solutions have been calculated and the conditions of its chemisorptive attaching to the surface of woven fabrics on a basis of cellulose have been optimized. The optimal conditions for CAN interaction with Hg(II), Mn(VII) and Ce(IV) ions in aqueous and aqueous-organic media have been stated; the main chemical and analytical characteristics of redox reactions target and by-products have been calculated. The sorption-spectroscopic and colorimetry characteristics of CAN complexes with Hg(II) and Mn(VII) on the surface of woven materials from cotton and flax have been studied. The colorimetry functions whose values were related to the cellulose woven materials surface structural features as well as their contribution to the formation of complex resulting color on the carrier have been calculated according to the diffuse reflectance spectra data. The equicontrasting colorimetry test-scale systems based on the "CAN- flax" system have been developed using the principles of the method colorimetry and subsequent computer processing of the results. It has been stated the introduction of acetonitrile into the aqueous redox system Ce (IV)-CAN after oxidation-reduction in acidic medium and subsequent change in the acidity of the reaction mixture to alkaline to result the demixing of homogeneous water-organic system, and the volume of the separated organic phase was correlated with the Ce (IV) ion concentration in the initial solution. Based on the analytical forms found in the redox systems of the M- CAN, the Hg(II) and Mn(VII) determining methods have been developed in variants of the transmission spectroscopy, diffuse reflectance and visual colorimetry, and Ce (IV) - by the volume of the separated organic phase and spectrophotometrically, respectively, in waste waters, steels, wines, rocks, pharmaceutical samples bioactive addition "Spirulina and valerian root. The correctness of the developed techniques has been confirmed by analysis of standard samples of carbon steels of U1k and UNL8v types, rock "Gabbro Esseksitovoe, Lake Baikal bottom silt.