Gyurcsányi R E, Pergel E, Nagy R, Kapui I, Lan B T, Tóth K, Bitter I, Lindner E
Hungarian Academy of Sciences, Institute of General and Analytical Chemistry, Budapest University of Technology and Economics.
Anal Chem. 2001 May 1;73(9):2104-11. doi: 10.1021/ac000922k.
Scanning electrochemical microscopy (SECM) supplemented with potentiometric measurements was used to follow the time-dependent buildup of a steady-state diffusion layer at the aqueous-phase boundary of lead ion-selective electrodes (ISEs). Differential pulse voltammetry is adapted to SECM for probing the local concentration profiles at the sample side of solvent polymeric membranes. Major factors affecting the membrane transport-related surface concentrations were identified from SECM data and the potentiometric transients obtained under different experimental conditions (inner filling solution composition, membrane thickness, surface pretreatment). The amperometrically determined surface concentrations correlated well with the lower detection limits of the lead ion-selective electrodes.
采用扫描电化学显微镜（SECM）并辅以电位测量，以跟踪铅离子选择性电极（ISE）水相边界处稳态扩散层随时间的形成。将差分脉冲伏安法应用于SECM，以探测溶剂聚合物膜样品侧的局部浓度分布。根据SECM数据以及在不同实验条件（内充溶液组成、膜厚度、表面预处理）下获得的电位瞬变，确定了影响与膜传输相关的表面浓度的主要因素。通过安培法测定的表面浓度与铅离子选择性电极的检测下限相关性良好。
