摘要
推导并验证了信号与金膜厚度的比值较小（即低信膜比）时金膜电极电位溶出分析法的过渡时间方程式和电位时间方程式。实验确定的理论式的应用条件为τ／ｌ２≤５８×１０１０ｓ／ｃｍ２，并发现当扩散路径约为扩散层厚度的３倍时，便可按半无限扩散条件处理扩散问题。从而解决了利用小信号进行金膜电极电位溶出基本问题，即信号与浓度的定量关系。
Transition time equation and potential_time equation describing the potentiometric stripping processes on a thin gold film electrode(TFGE)are presented. The equations were verified experimentally under the condition that the ratio of signal to the square of film thickness τ/l2≤58×10 s·cm-2. It was found that the diffusion process can be treated as semi_infinite, provided the diffusion path is approximately three times of the diffusion layer thickness. Thus, the basic problem of handling small signals with gold_film electrode stripping has been solved. In other words, a quantitative relationship between the signal and metal concentration has been established.
出处
《分析测试学报》
CAS
CSCD
1998年第3期13-17,共5页
Journal of Instrumental Analysis
关键词
金膜电极
半无限扩散
扩散层厚度
电位溶出分析
Potentiometric stripping analysis, Gold film electrode, Diffusion layer thickness, Semi_infinite diffusion
