Author Identifier

Amir Razmjou: https://orcid.org/0000-0002-3554-5129

Document Type

Journal Article

Publication Title

Computers and Electronics in Agriculture

Volume

227

Publisher

Elsevier

School

School of Engineering

RAS ID

75854

Comments

Abdollahzadeh, M., Zhu, Y., Bayatsarmadi, B., Vepsäläinen, M., Razmjou, A., Murugappan, K., ... & Asadnia, M. (2024). Portable multiplexed ion-selective sensor for long-term and continuous irrigation water quality monitoring. Computers and Electronics in Agriculture, 227. https://doi.org/10.1016/j.compag.2024.109455

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.

DOI

10.1016/j.compag.2024.109455

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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