A Simple Diffusion Cell for the Determination of Absolute Diffusion Constants using Radioactive Tracers

A Simple Diffusion Cell for the Determination of Absolute Diffusion Constants using Radioactive Tracers
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使用放射性示踪剂测定绝对扩散常数的简单扩散池

DOI:
10.1139/v71-256
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发表时间:
1971
期刊:
影响因子:
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通讯作者:
W. Dyck
W. Dyck
中科院分区:
--
文献类型:
--
作者:
W. Dyck

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用显微镜载玻片作为扩散光栅,制作了一个玻璃扩散池,可以测定γ射线发射元素在水溶液中的绝对扩散常数。在25 °C下,用110 Ag作为示踪剂,用0.01 M AgNO 3对该扩散池进行了测试,得到体扩散系数为1.64 × 10 − 5 cm 2/s,自扩散系数为1.48 × 10−5 cm 2/s。在pH值为−0.48 ~ 7.5的范围内,氢离子浓度对AgNO 3的扩散系数没有可检测到的影响。        中等浓度(> 0.1 M)的Na或Fe(III)离子或蔗糖分子的存在导致扩散系数显著降低。  
Using microscope slides for the diffusion grating, a glass diffusion cell was constructed which permitted the determination of absolute diffusion constants of γ-ray emitting elements in aqueous solutions.The cell was tested at 25 °C with 110Ag as tracer and gave a bulk-diffusion coefficient of 1.64 × 10 −5 cm2/s and a self-diffusion coefficient of 1.48 × 10−5 cm2/s using 0.01 M AgNO3.The hydrogen ion concentration had no detectable effect on the diffusion coefficient of AgNO3 in the pH range −0.48 to 7.5. The presence of Na or Fe(III) ions, or sucrose molecules at moderate concentrations (> 0.1 M) resulted in a marked decrease in the diffusion coefficient.