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在25℃下,以2MNaClO_4维持水相的离子强度恒定,用离子交换法测定了除Ce和Pm以外的镧系元素及钇与CNS~-和NO_3~-的络合作用。用北京大学6912计算机处理了实验数据。结果表明:(1)RE~(3+)与CNS~-的络合作用不大,当[CNS~-]≤1.5M时,主要以RECNS~(2+),RE(CNS)_2~+及RE(CNS)_3三种络合物形式存在;镧系元素与CNS~-的络合度Y_((1))随原子序数Z的增大,总的趋向是增大,钇的Y_((1))值为最小。(2)RE~(3+)与NO_2~-的络合作用较弱,当[NO_2~-]≤1.5M时,主要的络合物是RENO_3~(2+);各镧系元素与NO_3~-的Y_((1))随Z的增大,总的趋向是减小,钇的Y_((1))值最小。(3)在本实验中,稀土络合离子在树脂上的吸附量是可以忽略不计的。
At 25 ℃, the ionic strength of the aqueous phase was maintained at 2 MNaClO 4 and the complexation of lanthanides and yttrium with CNS ~ - and NO 3 ~ - with the exception of Ce and Pm was determined by ion exchange method. Using Peking University 6912 computer processing experimental data. The results show that: (1) RE ~ (3 +) has little complexation with CNS ~ (-), And RE (CNS) _3. The complex degree Y_ ((1)) of lanthanide with CNS ~ - increases with the increase of atomic number Z, and the Y_ ( (1)) is the smallest. (2) The complexation of RE ~ (3 +) with NO_2 ~ - is weak. When [NO_2 ~] ≤1.5M, the main complex is RENO_3 ~ (2+); the lanthanides and NO_3 (- 1) with increasing Z, the general trend is to decrease, Y_ ((1)) value of yttrium is the smallest. (3) In this experiment, the amount of rare earth complex ion adsorbed on the resin is negligible.