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Abstract  

The extraction equilibrium of ternary ion-association complexes obtained during the reaction of tetrachloride complex of thallium(III) and monotetrazolium salts triphenyltetrazolium chloride (TTC) or thiazolyl blue (MTT) has been studied. The optimum conditions that are required to carry out the investigations have been found. As a result of using a developed chemical model, the constants of extraction, distribution and association, the distribution coefficients and the recovery factor of investigated ionassociates have been determined radiochemically.

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Abstract  

The extraction equilibrium of ternary ion-association complexes formed between the tetrachloro complexes of thallium(III) and ditetrazolium salts, neotetrazolium chloride (NTC)[2,2′,5,5′-tetraphenyl-3-3′-(p-biphenylene)ditetrazolium chloride] and nitrobluetetrazolium chloride (NBT)[3,3′-dianizole-4,4′-bis-2-(4-nitrophenyl-5-phenyltetrazolium chloride], has been studied. As a result, the extraction constants, the distribution constants, the association constants, the distribution coefficients of thallium(III) and the extraction indicators R, have been calculated. The results have been evaluated statistically. The relative standard deviations Sr have been calculated at a statistical certainty of 95%. The ratio ditetrazolium salts/TlCl 4 =1∶2 has been confirmed once again.

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Abstract  

The optimum conditions for extraction of niobium(V) as a ternary ion-association complex with pyrocatechol and triphenyltetrazolium chloride(TTC) have been determined. The investigation of the composition has shown that the ratio Nb:proocatechol:TTC is 1:2:1 Kex, KD and have been determined radiometrically, using the chemical model. The influence of foreign ions on the extraction of the ion-association complex has been studied. A method for artifical mixture and steel containing niobium has been used.

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Abstract  

Extraction radiochemical investigations of ternary ion-association thiocyanate complexes of Co(II) with nitroblue tetrazolium chloride (NBT) [(3,3-dianizol-4,4-bis) 2-(4-nitrophenyl)-5-phenylnitrotetrazolium chloride] and triphenyltetrazolium chloride (TTC) [2,3,5-triphenyltetrazolium chloride] have been carried out. Molar ratios of the reacting components have been determined as NBT/[Co (SCN)4]2–=11 and TTC/[Co(SCN)4]2–=21. Using a chemical model and the method of Likussar — Boltz we have determined the values , Kex and KD, characterizing the extraction process. The results have been statistically treated. The relative standard deviation Sr has been calculated at a confidence level of 95%.

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Abstract  

The extraction equilibrium of the ternary ion-association complex of iodo-nitro-tetrazolium [3-(4-iodophenyl)-2-(4-nitrophenyl)-5-phenyltetrazolium chloride] with the chlorocomplex of thallium(III) is investigated radiochemically. The molar ratio of the ion-associate is found to be 1∶1, the association constant has a value of β=3.2·103 in aqueous solution and the distribution constant is KD=8.9. The extraction constant which gives a quantitative characterization of the equilibrium has a relative high value, E=2.3·104. This enables a convenient application of the investigated system for analytical purposes.

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Abstract  

It is possible to extract Sb(V), even in traces, nearly completely from 6M HCl by 2,3,5-Triphenyltetrazoliumchloride (TTC). The molar ratio of the ion associate in the organic phase is found to be 1∶1. Graphic evaluation of radiometric measurements using125Sb as tracer give the following results: extraction constant Kex=1.65·104, distribution constant KD=19.95, stability constant of the ion associate β=0.83·103.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. Krivokhatsky
,
Yu. Dubasov
,
E. Smirnova
,
N. Skovorodkin
,
V. Savonenkov
,
B. Alexandrov
, and
E. Lebedev

Abstract  

Actinide elements concentrations in the products of near release from CNPP accident were estimated. The data on uranium,237Np,241Am and plutonium and curium isotopes content in fuel particles are given. Sums of -emitting radionuclides and plutonium isotopes in reactor graphite particles and of uranium,242Cm,239+240Pu isotopes in the soil and aerosol samples were also determined. By 1989 soil and dust contamination in near release of the accident is due to long-lived -emitting plutonium isotopes.

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