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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