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Information × Registration Number 0219U003511, 0116U000836 , R & D reports Title New tools, media and reagents for sample preparation and development of the new methods of analysis of environmental and technical objects popup.stage_title Head Urchenko Oleg, Registration Date 17-01-2019 Organization Kharkov National University named after V.N. Karazin popup.description2 The object of investigation is an improvement of precision, accuracy, selectivity of precursors to obtain the mixed strontium halides, polymer sorption materials; determination of toxicants admixtures in multicomponent systems, methods of deoxidization of chloride melts in reactive gas medium; processes of complex formation of the metals with PAN in aqua-micellous media, equilibria in exchange reactions on 8 hydroxyhinoline in complexes, in ultrasound of high and low frequencies, determination of toxicant admixtures in multicomponent systems, deoxidization, based on mixed potassium and strontium halides from oxygen, contains admixtures by gaseous halogenate agents, single crystals, based on mixed potassium and strontium chlorides, activated by Europeum. Subject of investigation. The preparation of multifunctional standard samples of composition for spectroscopic methods of analysis, conditions of obtaining polymer sorbents with different degree of cross-linkage, the dependence of physical characteristics of polymeric sorption materials on synthesis conditions, the use of ultrasound for intensification of sample preparation, single crystals of mixed alkali and alkaline earth halides activated with Europeum; obtaining complexes of PAN with d-elements, charge for the single crystals growth, based on mixed potassium and strontium chlorides, the process of carbobromate of KSr2Br5 alloy, the process of single crystals of K2SrCl4 : Eu2+ growth. The purpose of investigation is to develop new theoretical base, methods and medias to intensification of sample preparation, metrological characteristics, methodic of analysis of the many component systems, new methods to control admixtures in the perspective halide functional materials. Methods. Atomic absorption (AAS) and atomic emission spectrometry with inductive coupled plasma (AES-ICP), X-ray fluorescent analysis (XFA), potentiometry, treatment, using ultrasound, titrimetric methods, sonoluminescent spectroscopy, spectrophotometry, extraction, linear-algebraic methods of results treatment, carbohalogenition, Bridgement-Stockbagger method,luminescent, spectral-kinetic . Obtained results and their novelty: - ?-diketonates of metals compare with earlier analogs are found to have considerable advantage for the case of their use as standard composition samples for AAS, AES-ICP and XFA; - the possibility of performing calibration in water-based and organic liquids, with the use of samples in solid state and in solutions; - the detection limits of metals in multicomponent systems, containing complexes of the metals with organic ligands, were decreased; - an accuracy, precision and express of analytes determination was supplied; - new ways to obtain new sorbents, based on polymeric matrix with incorporated inorganic micro- and nano- particles, sorption materials to extract rare earth metals from aqua media were developed; - theoretical bases, concerning simultaneous action of low- and high-frequency ultrasound in processes of sample preparation were improved; dissolution, intensification of acidic mineralization in food materials, sorption were developed; - the temperature dependence of magnesium oxide solubility MgO in K2SrCl4 melt can be predicted on the basis of the Shreder-LeChatelier equation; - the affinity of K2SrCl4 melt to oxide ions at different temperatures was estimated; - kinetic parameters of carbohalogenation of K2SrCl4 alloy by СCl4 vapor at different temperatures (reaction order, rate constants, activation energy) were determined; - a project of laboratory methodic of synthesis and deoxidization of charge for obtaining single crystals based on mixed potassium and strontium chlorides activated with Europeum was developed. -the process of exchange PAN on 8 hydroxyhinoline in aqua-micellous media for chelates of d-elements was investigated at first; -it was shown that by these properties we can analyze complex four components ions mixtures; -an accuracy, precision and express of analytes determination in many components systems was supplied; - the method to determine quantitative absorbed sound chemical ultrasound energy in sodium chloride solutions was developed; -the mechanism of ultrasound influence on the processes of destruction and solubility of the complex organic compounds in inorganic salts was proposed; -the solubility product of MgO in K2SrCl4 alloy at 973 К was determined at first; -it was shown that in chloride alloys, contains Sr2+ as a biggest oxide-ions, exists like complexes Sr3O4+ or 2SrCl2·SrO; -it was shown at first that KSr2Cl5 alloy may be purified up to рО = 6,78 by carbohalogenation; -it was estimated at first the rate constant of the process at 973 as 1,8·105 kg·mol-1·min-1; -it was worked out at first the methodic to obtain charge to obtain single crystals, based on mixed potassium and strontium bromides; -the project to grow single crystals based on mixed potassium and strontium bromides, activated by Europeum, was developed; the luminescence properties of the single crystals samples were investigated at first; -the investigation, deals with using ultrasound of different frequencies and intensities in the carotene production from "Dunaliella Salina" alga and the "Blakeslea trispora" fungus was carried out. It was shown that using of two-frequency ultrasound let us, compare with single -frequency one, to increase extraction degree of carotene from 40-92% up to 95-98%. Moreover, two-frequency ultrasound let us to carry out quantitative carotene extraction from the mother algae of "Dunaliella Salina" type, that vegetate in the basins, waste products of the salt industry, and are different to the alga that vegetate in the industrial basins, by high acoustic power. The most important factors of the ultrasound intensities on the process of destruction of "Dunaliella Salina" alga and on carotene concentration by co precipitation was established; -the technological elements:1) to obtain carotene solution from oil of "Dunaliella Salina" alga by ultrasound intensification;2) to obtain crystalline carotene from "Dunaliella Salina" alga by ultrasound intensification;3) to obtain carotene solution from oil of "Blakeslea trispora" fungus; 4) to obtain colloid solution of biomass of "Dunaliella Salina" alga; were developed; -the routine of charge synthesis and growth of single crystal of K(Sr0,99Eu0,01)2Br5 composition, that demonstrates scintillation properties, was developed. Eu2+ ions substitute isomorphic Sr2+ ions in matrix of KSr2Br5 composition. The value of the distribution coefficient of Eu2+ in the KSr2Br5 matrix is close to one, that can serve as an evidence of the perfect isomorphism of Sr2+ and Eu2+ ions; - the X-ray- and photoluminescence spectra of the obtained material are proper to Eu2+-activated scintillators with the low-symmetric lattices and both emission spectra include a narrow band with the maximum placed in 443-448 nm range and FWHM values is ca. 20 nm. The scintillation light decay time (1.63 ?sec) is in a good agreement with the duration of the existence of excited Eu2+ center in the similar matrixes. -the related light yield of K(Sr0,99Eu0,01)2Br5 single crystal is equal to 25 per cent vs. that of NaI:Tl and the energy resolution is 10.7 %. Product Description popup.authors Бєліков К. Бакланов О. Бакланова Л. Брильова К. Буніна З. Ларін В. Реброва Т. Титова Н. Чегренець В. Черножук Т. Юрченко О. popup.nrat_date 2020-04-02 Close