Author Identifier (ORCID)
Amir Razmjou: https://orcid.org/0000-0002-3554-5129
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.
Document Type
Journal Article
Date of Publication
12-1-2024
Volume
227
Publication Title
Computers and Electronics in Agriculture
Publisher
Elsevier
School
School of Engineering
RAS ID
75854
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
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