A study of the behavior of cadmium and zinc microquantities in sorption and coprecipitation processes in tetrahydrofuran solutions

作者：Kulyukhin S A^*; Veleshko I E

来源：Journal of Radioanalytical and Nuclear Chemistry, 2009, 280(2): 283-286.

DOI：10.1007/s10967-009-0512-x

The sorption of (109)Cd and (65)Zn microquantities with NaX and NaA zeolites in the presence of divalent lanthanides (Ln(2+)) (Ln=Tm, Dy, and Nd) from tetrahydrofuran (THF) solutions was studied. It was found that in contrast to (137)Cs(+), (109)Cd and (65)Zn, as well as (85)Sr(2+) microquantities were sorbed by zeolites very poorly: similar to 99% of the species remained in solution. The distribution coefficients (K (d) ) of (109)Cd and (65)Zn were similar to 0.3 and similar to 0.4 ml/g, respectively. When Tm(2+) was used as a reducer, it partially oxidized in solution to Tm(3+) to form precipitates of the composition TmI(3)center dot 3THF. A study of the co-crystallization of (109)Cd and (65)Zn, as well as (85)Sr(2+) microquantities with the TmI(3)center dot 3THF solid phase in the presence of Tm(2+) from THF solutions showed that in contrast to (85)Sr(2+), (109)Cd and (65)Zn microquantities co-crystallized with the TmI(3)center dot 3THF solid phase. The co-crystallization coefficients (D) for (109)Cd and (65)Zn depended on the ratio Tm(3+)/Tm(2+) in solution and increased with its increasing. The assumption was made that in the presence of Tm(2+), (109)Cd(2+) and (65)Zn(2+) form M(+) ions, which quickly react with M(2+) ions to form dimers of the composition M(2) (3+) (M=Cd and Zn).

• 出版日期2009-5