In this article, we investigate the distribution of traces of Na, K, Ca, and Sr during the fractionated precipitation of barium carbonate from barium chloride solution with ammonium carbonate. The results of trace distributions were determined with Na-24, K-42, Ca-45, and Sr-85 isotopes. In a concentration range of 1 x 10(-4) to 1 x 10(-3) % (related to BaCl2) at 80% of matrix precipitation the following quantities of trace impurities remained in the solution (%) Na: 89-94, K: 92-98, Ca: 38-47, and Sr: 35-26. The influence of DCTA complexing agent on impurities distribution was found to be insignificant. The distribution of Cd(II), Co(II), Cu(II), Fe(III), Mn(II), Ni(II), Pb(II), and Zn(II) in single-mode precipitation BaCO3 with (NH4)(2)CO3 was also investigated in the presence of EDTA and DCTA, and without any complexing agent. The AAS method was used to determine traces of heavy metal content. After a precipitation of 80% of matrix BaCO3 in presence EDTA, and 1 x 10(-4) % initial trace concentrations, the following quantities (%) of 55 Cd, 70 Co, 72 Cu, 52 Fe, 70 Mn, 83 Ni, 60 Pb, and 67 Zn remained in the solution. The results were used for the optimization of BaCO3 obtainment.