Pavlova O. Ferrate(VI) titrimetric determination with chromium(III) alkaline solutions

Object of research - reaction between ferrate(VI) and chromate(III) in alkaline media. The aim of the research - to determine the chemical analytical properties of concentrated alkaline Cr(III) solutions and to establish the possibility of their application for titrimetric ferrate(VI)-ions determination. Research methods - ESR and NMR 1H spectroscopy, voltamperometry, spectrophotometry (the investigation of Cr(III) complexation and physicochemical properties of chromite solutions). Potentiometry, amperometry with one and two indicator electrodes and spectrophotometry (the study of reaction between Fe(VI) and Cr(III), the development of methods for Fe(VI) and Mn(VII, VI) determination and the analysis of ferrate-manganate solutions). Theoretical and practical results - the possibility of application of concentrated alkaline Cr(III) solutions for the direct titrimetric ferrate(VI)- and manganate(VII, VI)-ions determination in strong alkaline medium with using of different instrument methods for the equivalence point fixation was proved. New analytical methods for ferrate(VI) determination were developed; they make it possible to improve the analysis of 10^-5-10^-2 М ferrate(VI) solutions, to control the concentration of manganese(VII, VI)-ions and to analyse their mixtures. Novelty of statements and results - scientific results relative to the investigation of the chemical analytical properties of concentrated alkaline Cr(III) solutions and their application for the direct titrimetric ferrate(VI) and manganate(VII, VI)-ions determination are new. The range of application - analytical chemistry: ferrate(VI)-ions determination.