Collect. Czech. Chem. Commun. 1981, 46, 3083-3087

Solubility of thallium pertechnate in nitrate solutions

Vladimír Mikulaja, Eva Mišianikováb and Fedor Macášeka

a Department of Nuclear Chemistry, Comenius University, 816 31 Bratislava
b Price Research Institute, 801 00 Bratislava


Solubility of TlTcO4 was determined in water and in HNO3, NaNO3, NH4NO3, Ca(NO3)2, and LiNO3 aqueous solutions in concentrations 5-8 mol l-1. The solubility increases with increasing concentration of the electrolyte; the values measured were used for a calculation of the stoichiometric molar activity coefficients of the Tl+ and TcO4- ions. The activity coefficient values corrected for the fraction of the nonassociated Tl+ ions approach those of the base electrolytes up to their concentrations of 4-5 mol l-1.