金属离子络合后的扩散问题——I.溶液中的扩散(Co~(2+)-EDTA和UO_2~(2+)-H_2SO_4体系)

金属离子络合后的扩散问题——I.溶液中的扩散(Co~(2+)-EDTA和UO_2~(2+)-H_2SO_4体系)

PROBLEMS INVOLVED IN THE DIFFUSION OF COMPLEXED METAL IONS——I. DIFFUSION IN SOLUTION (CO~(2+)-EDTA and UO_2~(2+)-H_2SO_4 SYSTEM)

摘要

摘要: 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。

Abstract: An equation used to characterize the diffusion rate of complexed metal ion is Being proposed as follows;where Ci is concentration of each species, including simple metal ion and step-wise formed complex ions-, Di, is diffusion coefficient of each species-Dr is apparent diffusion coefficient; CT =∑Ci.The diffusion coefficients of Co2+ and CoY2- were determined at 25℃ and μ= 0.10, to be DCo2+=(7.1±0.2)×10-8cm2/s, DCoY2- = (5.4±0.1)×10-6 cm2/s. When Co2+ is present in equilibrium with CoY2~ in solution, it has been demonstrated that the apparent diffusion coefficient of species containing cobalt obeys the above mentioned equation. Then, apparent diffusion coefficients of species containing UO22+ in UO22+-H2SO4 system were determined, and the diffusion coefficients of UO22+, UO2SO4, UO2(SO4)22-, UO2 (SO4)34- were calculated according to the proposed equation. The calculated value of DUO22+=5.0×10-6cm2/s agrees very well with its determined value.

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