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  • Author or Editor: K. Přikrylová x
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Abstract  

The theory is given of errors of the title method based on the solvent extraction reaction Aaq+Baq⇌ABorg, the minimum amounts which can be determined are assessed, the desirable values of ξ are recommended and the precision of the title method is compared with that of the concentration dependent distribution method. Tables are given allowing a rapid calculation of the error of determination for any reasonable concentration of the substance to be determined, any extractant concentration and a chosen value of ξ if the equilibrium constant of the above reaction is known.

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Abstract  

The theory of errors of three variants of sub- and super equivalence method is given and errors for typical cases are tabulated. The principles of the variants are described. Recommendations are offered for a rational choice of a variant to be used and for that of the parameter . For the calculations the assumption is used that the analysis is based on the solvent-extraction equilibrium+ A+BABorg.

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Abstract  

The precision of the title method is analyzed theoretically for a hypothetical case of solvent extraction involving the reaction. It was found that there exists a certain reagent concentration giving the lowest errors. If the error in the determination of distribution ratios is 2%, a broad range of conditions exists where the error of the result is near to or less than 1%. The ranges of the values H 1/N are found for N=1,2 3 for cases where the error of the results is 1%.

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Abstract  

The precision and accuracy of two closely similar radioanalytical methods are compared using the statistical approach (5 parallel experiments for each distribution): sub- and superequivalence isotope dilution analysis and concentration dependent distribution. The solvent extraction system used for both procedures involves the distribution of radiobarium between aqueous phase and nitrobenzene solution of the acid of cobalt dicarbolide H+ {–(3)–1,2–B9C2H11]2 Co and mono-p-nonyl phenyl ether polyethylene glycol HO(CH2 CH3 O)20–(C6H4)C9H13. The influence was tested of the choice of a concrete person to evaluated the results of the analysis by graphic methods upon the precision and accuracy. The advantages and drawbacks of different graphical evaluation procedures are compared.

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