Potentiometric Sensor System with Self-Calibration for Long-Term, In Situ Measurements

被引：2

作者：

Zhang, Zhehao ^{[1
]}

Boselli, Elena ^{[1
]}

Papautsky, Ian ^{[1
,2
]}

机构：

[1] Univ Illinois, Dept Biomed Engn, Chicago, IL 60607 USA

[2] NSF Ctr Adv Design & Mfg Integrated Microfluid CAD, Chicago, IL 60607 USA

来源：

CHEMOSENSORS | 2023年 / 11卷 / 01期

基金：

美国国家科学基金会;

关键词：

ion-selective electrode; printed circuit board; in situ measurement; potentiometry; self-calibration; TECHNOLOGY; MAIZE;

D O I：

10.3390/chemosensors11010048

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We built an integrated solid-contact ion-selective electrode (SCISE) system with the functionality of self-calibration. A multiplexed SCISE sensor (K+ and NO3- vs. Ag/AgCl) was fabricated on printed-circuit board (PCB) substrates and was subsequently embedded into a microfluidic flow cell for self-calibration and flow-through analysis. A PCB circuit that includes modules for both sensor readout and fluid control was developed. The sensors showed a fast and near-Nernstian response (56.6 for the K+ electrode and -57.4 mV/dec for the NO3- electrode) and maintained their performance for at least three weeks. The sensors also showed a highly reproducible response in an automated two-point calibration, demonstrating the potential for in situ monitoring. Lastly, the sensor system was successfully applied to measure mineral nutrients in plant sap samples.

引用

页数：11

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