Portable multiplexed ion-selective sensor for long-term and continuous irrigation water quality monitoring

Mojtaba Abdollahzadeh, Yujie Zhu, Bita Bayatsarmadi, Mikko Vepsäläinen, Amir Razmjou, Krishnan Murugappan, Theo Rodopoulos, Mohsen Asadnia*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In agricultural contexts, the demand for continuous and precise measurement of multiple ions is crucial. While arrays of solid-contact ion-selective electrodes (SCEs) have been developed previously, there has been limited emphasis on their continuous and long-term monitoring of ions. Addressing this gap, our work introduces an innovative sensor array utilizing Ni-HAB MOF as an ion-to-electron transducer, enabling real-time detection of nitrate, potassium, and pH levels. The sensors exhibit exceptional stability, eliminating the need for frequent recalibration. For instance, the K+-selective sensor displays an unprecedentedly low potential drift of 0.05 µV/h, surpassing existing solid-contact sensors by two orders of magnitude. Similarly, the pH sensor demonstrates a drift of 0.3 µV/h, outperforming competitors by a factor of 100. The NO3--selective sensor shows minimal drift at 0.5 µV/h, surpassing comparable sensors by a factor of ten. Additionally, the K+-selective sensor features a sensitivity of 57.8 mV/dec and a LOD of 1.9 µM, while the NO3--selective sensor offers a sensitivity of 56.8 mV/dec and a LOD of 6.23 µM. Integrated into a portable array with wireless data transmission, this system enables real-time water quality monitoring in remote areas. Rigorous testing of the developed sensor array in a tailored complex agricultural solution confirms its selective response to target ions even in the presence of interfering ions. Importantly, pH fluctuations do not compromise the precision of the K+ and NO3-- selective sensors, highlighting the system's robustness in real-world agricultural settings.
Original languageEnglish
Article number109455
JournalComputers and Electronics in Agriculture
Volume227
DOIs
Publication statusPublished - Dec 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • Environmental chemical engineering
  • MOF
  • Multiplex ion sensing
  • Potentiometric sensors
  • Sensor array
  • Water quality monitoring

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