Gyurcsányi Róbert E, Lindner Ernö
Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, Budapest, Hungary-1111.
Anal Chem. 2005 Apr 1;77(7):2132-9. doi: 10.1021/ac048445j.
High-resolution spectroscopic imaging of the cross section of ion-selective membranes and the adjoining solution phases during real-time electrochemical measurement is termed as spectroelectrochemical microscopy (SpECM). The novel SpECM instrument utilizes wavelength-dispersive multispectral imaging of a thin membrane strip separating the two sides of a four-electrode thin-layer electrochemical cell. SpECM is aimed as a tool for optimizing the experimental conditions in mass transport-controlled ion-selective electrode membranes for improved detection limit. Some of the capabilities of the new technique are demonstrated using fix site, chromoionophore-based, pH-sensitive membranes as model systems. The experimental results are discussed in the light of the existing theory of fixed-site membranes. The quantitative expression for the time-dependent change of the free ionophore concentration across the ion-selective membrane showed close correlation to the recorded concentration profiles.
在实时电化学测量过程中，对离子选择性膜的横截面以及相邻溶液相进行高分辨率光谱成像，这被称为光谱电化学显微镜（SpECM）。这种新型的SpECM仪器利用波长色散多光谱成像技术对分隔四电极薄层电化学池两侧的薄膜条进行成像。SpECM旨在作为一种工具，用于优化传质控制的离子选择性电极膜中的实验条件，以提高检测限。使用固定位点、基于发色离子载体的pH敏感膜作为模型系统，展示了这项新技术的一些功能。根据现有的固定位点膜理论对实验结果进行了讨论。离子选择性膜上自由离子载体浓度随时间变化的定量表达式与记录的浓度分布显示出密切的相关性。
