Petrushyna G. The 18-molybdodiphosphate anion - a new analitycal redox reagent

Object of study - reaction of reduction of 18-molibdodiphosphate (18-MPC) and oxidation of its reduced forms. Purpose - a substantiation of 18-molybdodiphosphate and its reduced forms use as analytical reagents for, study of their chemical and analytical characteristics to develop sensitive, express and simple spectrophotometric and visual methods for determination of some reducers and oxidizers. Methods: UV-vis spectrophotometry, chemical analysis, IR and NMR spectroscopy, colorimetry. The value of the results for theory and practice. The received results of research contribute to the development of chemistry heteropoly substance. The complex of methods of UV determination of ascorbic acid, acetaminophen, p-aminophenol, nitrite, the simultaneous determination of paracetamol and ascorbic acid, ascorbic acid and nitrite ions; visual determination of ascorbic acid and nitrite; colorimetric method of determining the ascorbic acid has been developed. Probably further use of reagents and techniques in the automated methods of the analysis, such as flow -injection, and for the construction of analytical sensors. The most significant scientific results. New analytical reagents - 18-molibdodiphosphate and its reduced forms are proposed. Theoretical basis of their use for the determination of reducers, their mixtures, oxidizers with different versions of fixing of an analytical signal are proved. Stability of reagents over a wide pH range (from 3 up to 11), high speed, and sensitivity was discovered. The dependence 18-molibdodiphosphate red-ox potential from pH causes selectivity of a reagent and an opportunity of simultaneous definition of two reducers. For the first time it is shown, that at addition of ions Bi (III) in acidic medium it is formed substituted heteropoly anion, that promotes improvement of metrological characteristics. For the first time the possibility of using four electronic heteropoly blue of 18-molibdodiphosphate as a reagent for the determination of oxidizers (nitrite) is shown. Conditions of definition of an oxidizer and a reducer at joint presence are recommended. The degree of implementation: some methods were implemented (private enterprise "Scientific and Production Company SVK", Oles Gonchar Dnepropetrovsk National University). Scope: the pharmaceutical industry, food industry.