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提出了一个表征金属离子在成络后的扩散速率的公式如下 D_TC_T=∑C_iD_i. 这里,C_i为第i种粒子的浓度(i包括简单金属离子和逐级络合离子);D_i为第i种粒子的扩散系数;D_T为表观扩散系数。测定了CO~(2+)和CoY~(2-)在25℃和μ=0.10时的扩散系数,D_(Co~(2+))=(7.1±0.2)×10~(-6)厘米~2/秒,D_(CoY~(2-))=(5.4±0.1)×10~(-6)厘米~2/秒。当CO~(2+)和CoY~(-2)平衡存在于溶液中时,证明含Co~(2+)粒子的表观扩散系数服从上式。又测定了UO_2~(2+)-H_2SO_4体系中含UO_2~(2+)粒子的表观扩散系数,按上式算出了UO_2~(2+)、UO_2SO_4、UO_2(SO_4)_2~(2-)、UO_2(SO_4)_3~(4-)的扩散系数,计算值D_UO_2~(2+)=5.0×10~(-6)厘米~2/秒,和测量值一致。
A formula for characterizing the diffusion rate of metal ions in the network is as follows: D_TC_T = ΣC_iD_i where C_i is the concentration of the ith particle (i includes simple metal ions and transition metal ions); D_i is the ith species Particle diffusion coefficient; D_T apparent diffusion coefficient. The diffusion coefficients of CO 2 and CoY 2- at 25 ℃ and μ = 0.10 were measured. The results showed that the diffusion coefficient of Co 2+ was 7.1 ± 0.2 × 10 -6 cm ~ 2 / sec, D_ (CoY ~ (2 -)) = (5.4 ± 0.1) × 10 ~ (-6) cm ~ 2 / sec. The apparent diffusion coefficient of Co2 + -containing particles is proved to be in the above formula when CO2 + and CoY2 are in equilibrium. The apparent diffusion coefficients of UO_2 ~ (2 +) particles in UO_2 ~ (2 +) - H_2SO_4 system were also determined. According to the above formula, the apparent diffusion coefficients of UO_2 ~ (2 +), UO_2SO_4, UO_2 (SO_4) ), And the diffusivity of UO_2 (SO_4) _3 ~ (4-), calculated as D_UO_2 ~ (2 +) = 5.0 × 10 ~ (-6) cm ~ 2 / s.