摘要
将银针在0.1 mol/L HCl电解液中采用恒电流法进行氯化处理,制备Ag/AgCl氯离子选择性电极。采用扫描电镜、能谱与XRD测试,考察氯化前后银表面厚度与表面物质元素的变化;通过对电极对氯离子响应时间的测量,考察电极电位对氯离子的敏感性;通过对响应斜率的测量,考察电极电位与浓度的相关关系。结果表明,在银表面经氯化处理后得物质是AgCl,该电极对氯离子的响应迅速且电位稳定,电极电位与氯离子的浓度呈线性相关关系。制备的选择性电极能在较大的pH值范围内使用,且其他离子对该电极的电位影响较小。
The silver probes were chlorided in 0.1 mol/L HCl by constant current method. Then, the Ag/AgCl chloride ion selecting probe electrode were prepared. The electrodes were studied by SEM, EDX and XRD, which can characterize the change of thickness and element on the surface of the electrode before and after chlorination. The electrode potential sensitivity to chloride ion was studied by measuring responsed time of electrode to chloride ion. Responsed slope was measured to investigate the correlation between electrode potential and concentration of Cl-. The results indicate that the substance is AgCl after chlorination treatment on Ag surface. The potential of electrodes are stable and sensitive with the change of chloride ion. The electrode potential and chloride ion concentration is a linear relationship. The selective electrode preparation can be used in a wide pH range. The electrode potential is difficult to be affected by other ions.
出处
《热加工工艺》
CSCD
北大核心
2015年第22期43-45,48,共4页
Hot Working Technology
关键词
选择性电极
氯离子
缝隙腐蚀
selecting electrode
chloride ion
crevice corrosion
