Bondar Anna, Mikhelson Konstantin
Chemistry Institute c/o, St. Petersburg State University, 26 Universitetsky Prospect, Stary Peterhof, 198504 St. Petersburg, Russia.
Sensors (Basel). 2022 Feb 2;22(3):1145. doi: 10.3390/s22031145.
The possibility of analysis using charge curve fitting in constant potential coulometric mode instead of using a calibration plot is explored, for the first time. The results are compared with the analysis based on the use of a calibration plot. A Ca ion-selective electrode, with and without an electronic capacitor in series, is used as a model system in pure solutions of CaCl. Both techniques delivered good results (error within 2%) when the final and the initial concentration values differed by not more than three times. Larger differences result in 10-25% error. The presence of an electronic capacitor in the measurement circuit and in series with the electrode, allows for significantly faster response.
首次探索了在恒电位库仑法模式下使用电荷曲线拟合进行分析而非使用校准曲线的可能性。将结果与基于校准曲线的分析进行了比较。在氯化钙纯溶液中，使用串联有和没有电子电容器的钙离子选择性电极作为模型系统。当最终浓度值和初始浓度值相差不超过三倍时，两种技术都给出了良好的结果（误差在2%以内）。差异较大时会导致10%-25%的误差。测量电路中与电极串联的电子电容器的存在，可使响应速度显著加快。
