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[en] A possibility of applying the method of laser stepwise photoionization atoms in vacuum to determine ytterbium trace quantities in (HCl + water) solutions is studied. Scheme of an experimental installation is described where a nitrogen laser with cross discharge simultaneously excites two dye lasers. Atomization of ytterbium chloride proceeds in an electrothermal atomizer at 1200 deg and pressure of 10^-4 Pa. Signal/noise ratio when detecting a signal from 10^-10 g Yb is equal to 200

[en] A technique for the analysis of the products of cadmium axide cation sublattice radiolysis is worked out. It is shown that cadmium determination in the solutions With the cadmium concentration of 10^-6 M and higher is possible to satisfactory error using the method of concentration element with Cd-selective indicator electrodes. The fact is revealed that the radiolysis products are formed in two modifications

[en] Technique of X-ray fluorescence determination of Pt, Ir, Pd, Rhl and RU in process solutions of variable composition containing about 20 elements is developed. The technique employs a combined method of an internal reference element in which mutual effect of the elements being determined is accounted for by means of multiple regression equations. During preparation to analysis the specimens were evaporated and dry residues were used as emitters. The reference elements were introduced into the specimens before evaporation. Change in weights due to evaporation Were taken into account in calculation of elemental concentrations. It is shown that reproducibility of the results of the analysis is characterized by a relative standard deviation eqUal to 5.5; 11.5; 4.2; 5.4 and 4.8%, respectively, for Pt, Ir, Rd, Rh and Ru. Limits of the Pt, Ir, Pd, Rh and Ru determination in the solutions calculated in compliance with 3s-criterion are, respectively, equal to: 0.007; 0.004; 0.007 and 0.004% g/l. Time requared to analyze one specimen, including preparation, is 5 to 6 h

[en] Main metrological characteristics of estimating the rates of dissolution of alloy components and impurites by neutron activation and gamma spectrometry are considered. It has been shown taking an 06KhN28MDT alloy (in 30% H₂SO₄) as example that the standard deviation of convergence of estimating the rates of dissolution of macro- and microcomponents is a function of the dissolution rate and depends mainly on the nonrep oducibility of sample surface state as well as on statistical errors of gamma-spectrometric analysis at low dissolution rates

[en] A universal combined solvent for organic samples and standard reference samples is suggested which is composed of oxylene and acetic aldehyde. A method has been developed for preparing multielement reference samples. A procedure has been worked out for atomic emission determination of As, Bi, Cd, Co, Cr, Cu, Fe, In, Ni, Pb, Re, Se, Su, Te, V, Zn in organic extracts. The limits of detection are between 0.05 and 1.6 μ/ml. The relative standard deviation is 0.01. The systematic error is very small

[en] The steep ascension technique was used to estimate optimal conditions for the formation and solvent extraction by chloroform of a different-ligand complex of tungsten with o-nitrophenylfluorone and diantipyrylmethane. The influence of significant factors on the absorbance has been examined. A procedure has been developed of determining tungsten in thin films of a Co-W system. The error is not greater than 5%

[en] Distribution of tartrate complexes of indium and gallium has been studied as a function of tartaric acid and tri-n-octylamine (TOA) concentrations. Gallium is extracted by less concentrated TOA solutions (0.09 M) and at lower tartaric acid concentrations than indium. The number of TOA and tartaric acid molecules involving into the extraction has been determined by the shift of equilibium and competitive reactions methods; the charge of the metal ions extracted has also been estimated. The mechanism of the extraction of the indium and gallium tartrate complexes has been established. The most reasonable extraction equation is given. It has been shown that gallium and indium are extracted via similar mechanisms. Tartaric acid is extracted together with tartrate complexes of the metals. The tartrate complexes are not extracted if the TOA solution is saturated with tartaric acid

[en] A method for the neutron activation determination of impurities in high-purity bismuth with separation of the oxychloride base, has been developed. A minimal value of solubility of oxychloride corresponds to a very narrow range of concentration of chlorine ions and strongly depends on the solution acidity. From the data on the microimpurities behaviour, a conclusion is drawn that the method suggested can be used fo r the determining of the content of 40-45 elements

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