TY - JOUR
T1 - Portable multiplexed ion-selective sensor for long-term and continuous irrigation water quality monitoring
AU - Abdollahzadeh, Mojtaba
AU - Zhu, Yujie
AU - Bayatsarmadi, Bita
AU - Vepsäläinen, Mikko
AU - Razmjou, Amir
AU - Murugappan, Krishnan
AU - Rodopoulos, Theo
AU - Asadnia, Mohsen
PY - 2024/12
Y1 - 2024/12
N2 - 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.
AB - 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.
KW - Environmental chemical engineering
KW - MOF
KW - Multiplex ion sensing
KW - Potentiometric sensors
KW - Sensor array
KW - Water quality monitoring
UR - http://www.scopus.com/inward/record.url?scp=85205459936&partnerID=8YFLogxK
U2 - 10.1016/j.compag.2024.109455
DO - 10.1016/j.compag.2024.109455
M3 - Article
AN - SCOPUS:85205459936
SN - 0168-1699
VL - 227
JO - Computers and Electronics in Agriculture
JF - Computers and Electronics in Agriculture
M1 - 109455
ER -