Microwave Sensor for Nitrate and Phosphate Concentration Sensing

Harnsoongnoen, Supakorn; Wanthong, Anuwat; Charoen-In, Urit; Siritaratiwat, Apirat

doi:10.1109/jsen.2018.2890462

Cited by 27 publications

(4 citation statements)

References 27 publications

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“…Among CPS for P monitoring, the few examples in the literature that propose smart systems with embedded data analytics either demonstrate poor selectivity or a lack of validation against gold standard analytical testing ( Akhter et al., 2022 ; Harnsoongnoen et al., 2019 ; Nag et al., 2019 ) (Table S1). To date, all CPS have focused on ortho-P in the peer reviewed literature, or more accurately soluble molybdate reactive phosphorus.…”

Section: Emergence Of Cyber Physical Systems For Monitoring Pmentioning

confidence: 99%

Perspective: Phosphorus monitoring must be rooted in sustainability frameworks spanning material scale to human scale

et al. 2023

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Section: Emergence Of Cyber Physical Systems For Monitoring Pmentioning

confidence: 99%

Perspective: Phosphorus monitoring must be rooted in sustainability frameworks spanning material scale to human scale

et al. 2023

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“…PCR method was used to divide samples into two groups using the S21 magnitude: sugars and organic acids (blue oval) and salts (red oval) in Figure 10. The following year Harnsoongnoen et al [58] proposed a novel approach to discriminate between phosphorus and nitrate using the transmission coefficient and the ratio between the resonance frequency and the frequency bandwidth at the magnitude of 10 dB. This proposed method offers high sensitivity for both nitrate and phosphates, but not yet the required specificity.…”

Section: Progresses and Challenges In Microwave Spectroscopymentioning

confidence: 99%

Real-Time Water Quality Monitoring with Chemical Sensors

Yaroshenko

Kirsanov

Marjanovic

et al. 2020

Sensors

100

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Water quality is one of the most critical indicators of environmental pollution and it affects all of us. Water contamination can be accidental or intentional and the consequences are drastic unless the appropriate measures are adopted on the spot. This review provides a critical assessment of the applicability of various technologies for real-time water quality monitoring, focusing on those that have been reportedly tested in real-life scenarios. Specifically, the performance of sensors based on molecularly imprinted polymers is evaluated in detail, also giving insights into their principle of operation, stability in real on-site applications and mass production options. Such characteristics as sensing range and limit of detection are given for the most promising systems, that were verified outside of laboratory conditions. Then, novel trends of using microwave spectroscopy and chemical materials integration for achieving a higher sensitivity to and selectivity of pollutants in water are described.

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“…8 Although ion chromatography and spectrophotometry used in the conventional plant nitrate tests provide high sensitivity and selectivity, they are not suitable for field application due to high cost, poor portability, and considerable consumption of agent and reagent. Low-cost portable sensors have recently been reported for monitoring nitrate availability in soils based on various sensing mechanisms, including ionselective electrodes, 9,10 field-effect transistors, 11 microwave resonance, 12 reflectance spectrometers, 13 microfluidic electrophoresis chips, 14 and enzymatic electrochemical sensors. 15 However, tools are unavailable for direct measurement of the nitrate concentration in planta without complex sample preparations, which has limited our ability to evaluate the nitrogen needs of plants (deficient, marginal, optimal, or excessive) and benchmark the performance of nitrogen management.…”

Section: Introductionmentioning

confidence: 99%

In Planta Nitrate Sensor Using a Photosensitive Epoxy Bioresin

Ibrahim

Yin

Moru

et al. 2022

ACS Appl. Mater. Interfaces

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Nitrogen management through monitoring of crop nitrate status can improve agricultural productivity, profitability, and environmental performance. Current plant nitrate test methods require expensive instruments, time-intensive labor, and trained personnel. Frequent monitoring of in planta nitrate levels of the stalks in living plants can help to better understand the nitrogen cycle and the physiological responses to environmental variations. Although existing enzymatic electrochemical sensors provide high selectivity, they suffer from short shelf life, high cost, low-temperature storage requirement, and potential degradation over time. To overcome these issues, an artificial enzyme (vitamin B12 or VB12) and a two-dimensional material (graphene oxide or GO) are introduced into a conventional photoresist (SU8) to form a bioresin SU8-GO-VB12 that can be patterned with photolithography and laser-pyrolyzed into a carbon-based nanocomposite C-GO-VB12. The electrocatalytic activity of the cobalt factor in VB12, the surface enhancement properties of GO, and the porous feature of pyrolytic carbon are synergized through design to provide C-GO-VB12 with a superior ability to detect nitrate ions through redox reactions. In addition, laser writing-based selective pyrolysis allows applying thermal energy to target only SU8-GO-VB12 for selective pyrolysis of the bioresin into C-GO-VB12, thus reducing the total energy input and avoiding the thermal influence on the materials and structures in other areas of the substrate. The C-GO-VB12 nitrate sensor demonstrates a year-long shelf lifetime, high selectivity, and a wide dynamic range that enables a direct nitrate test for the extracted sap of maize stalk. For in situ monitoring of the nitrate level and dynamic changes in living maize plants, a microelectromechanical system-based needle sensor is formed with C-GO-VB12. The needle sensor allows direct insertion into the plant for in situ measurement of nitrate ions under different growth environments over time. The needle sensor represents a new method for monitoring in planta nitrate dynamics with no need for sample preparation, thus making a significant impact in plant sciences.

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Microwave Sensor for Nitrate and Phosphate Concentration Sensing

Cited by 27 publications

References 27 publications

Perspective: Phosphorus monitoring must be rooted in sustainability frameworks spanning material scale to human scale

Perspective: Phosphorus monitoring must be rooted in sustainability frameworks spanning material scale to human scale

Real-Time Water Quality Monitoring with Chemical Sensors

In Planta Nitrate Sensor Using a Photosensitive Epoxy Bioresin

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