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  • Author or Editor: G. Bilimovich x
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Abstract  

A review of works devoted to the theoretical studies and practical applications of substoichiometric analysis is presented.

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Abstract  

The conditions for substoichiometric exchange extraction in the system
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$[(C_6 H_5 )_4 AsTaF_6 ]_{CHCl_3 } - (AuCl_4^ - )_w$$ \end{document}
have been investigated in order to establish the feasibility of substoichiometric separation of tantalum and its determination by activation.
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Abstract  

A method for the simultaneous isolation of a number of elements (In, Y, Zn, Co, Cd) from their mixture has been developed. The method is based on heterogeneous isotope exchange between the radionuclide of the element to be determined in the solution and a cation exchange plate saturated with the inactive form of the same element. The investigations were carried out with “Fixion 50X8” plates (Hungary) measuring 1 cm2. 5–6 ml of the test solution was used. In order to properly choose the optimum saturation conditions of the plates with the element to be determined the kinetics of sorption and isotope exchange and the pH were studied. It can be excepted that in the future this procedure will be widely used in the radioanlytical isolation and determination of many elements by isotope exchange and activation analysis. The automation of this radioanalytical procedure for serial analysis will become possible owing to the simplicity and elegance of the experimental technique.

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Abstract  

Interrelationship between the error of the radioanalytical methods and the concentration of the element to be determined has been found for extraction systems with different parameters Kex, pH, a concentration of the extractant. Based on a mathematical discussion of this interrelationship, the criterion of the estimation of sensitivity has been proposed for the different radioanalytical methods based on the substoichiometric principle as well as some deviations from it.

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Abstract  

The possibility of using coprecipitation on Cu(OH)2·nH2O and Fe2O3·nH2O precipitates to separate a part of zirconium unreacted with complexone in the presence of a 100-fold amount of impurities has been examined. The reaction between ethylenedia-minetetraacetic acid (EDTA) and zirconium 10−3−10−5 M has been used as substoichiometric reaction. A zirconium determination in the concentration range of 10−4−10−6 g/ml in artificial mixtures and steel samples has been developed using the systems of EDTA-Zr−Cu(OH)2·nH2O and EDTA−Zr−Fe2O3·nH2O.

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