Department of Optometry, Chung Hwa University of Medical Technology, Tainan 717, Taiwan.
Sensors (Basel). 2012;12(7):9687-96. doi: 10.3390/s120709687. Epub 2012 Jul 17.
In this paper, a novel signal processing circuit which can be used for the measurement of H(+) ion and urea concentration is presented. A potentiometric method is used to detect the concentrations of H(+) ions and urea by using H(+) ion-selective electrodes and urea electrodes, respectively. The experimental data shows that this measuring structure has a linear pH response for the concentration range within pH 2 and 12, and the dynamic range for urea concentration measurement is in the range of 0.25 to 64 mg/dL. The designed instrumentation circuit possesses a calibration function and it can be applied to different sensing electrodes for electrochemical analysis. It possesses the advantageous properties of being multi-purpose, easy calibration and low cost.
本文提出了一种可用于测量 H(+)离子和尿素浓度的新型信号处理电路。该电路采用电位法，分别使用 H(+)离子选择性电极和尿素电极来检测 H(+)离子和尿素的浓度。实验数据表明，该测量结构在 pH 2 到 12 的浓度范围内具有线性 pH 响应，尿素浓度测量的动态范围为 0.25 到 64mg/dL。所设计的仪器仪表电路具有校准功能，可应用于电化学分析的不同传感电极。它具有多功能、易于校准和低成本的优点。
