Fabrication of a hydrophilic property impedance sensor to stably monitor soil water content for slope failure prognostics

Futagawa, Masato; Ito, Takushi; Kunii, Arumi; Watanabe, Minoru; Suzuki, H.; Fuwa, Yasushi; Takeshita, Yuji; Komatsu, Masaaki

doi:10.1109/icsens.2015.7370547

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Previous efforts have enhanced hydrophilicity of the sensor surface (e.g., coating a hydrophilic SiOx film onto the Pt electrode, fabricating a hydrophilic SiO 2 /Si diaphragm sensor). , However, these sensors suffer from severe reading declination when the volumetric soil water content (%) drops below 15%, , since these hydrophilic sensor surfaces can only prevent water from moving away from the sensor surface but fail at absorbing more water from soil. These sensors cannot, therefore, facilitate the transport of targeted ions from the soil toward the sensor surface.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Understanding of Soil Nitrogen Fate Using a 3D-Electrospray Sensor Roll Casted with a Thin-Layer Hydrogel

Fan

Wang

Qian

et al. 2022

Environ. Sci. Technol.

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Accurate and continuous monitoring of soil nitrogen is critical for determining its fate and providing early warning for swift soil nutrient management. However, the accuracy of existing electrochemical sensors is hurdled by the immobility of targeted ions, ion adsorption to soil particles, and sensor reading noise and drifting over time. In this study, polyacrylamide hydrogel with a thickness of 0.45 μm was coated on the surface of solid-state ion-selective membrane (S-ISM) sensors to absorb water contained in soil and, consequently, enhance the accuracy (R 2 > 0.98) and stability (drifting < 0.3 mV/h) of these sensors monitoring ammonium (NH4 +) and nitrate (NO3 −) ions in soil. An ion transport model was built to simulate the long-term NH4 + dynamic process (R 2 > 0.7) by considering the soil adsorption process and soil complexity. Furthermore, a soil-based denoising data processing algorithm (S-DDPA) was developed based on the unique features of soil sensors including the nonlinear mass transfer and ion diffusion on the heterogeneous sensor–hydrogel–soil interface. The 14 day tests using real-world soil demonstrated the effectiveness of S-DDPA to eliminate false signals and retrieve the actual soil nitrogen information for accurate (error: <2 mg/L) and continuous monitoring.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Understanding of Soil Nitrogen Fate Using a 3D-Electrospray Sensor Roll Casted with a Thin-Layer Hydrogel

Fan

Wang

Qian

et al. 2022

Environ. Sci. Technol.

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“…Besides commercial microelectrode sensing systems for pH, dissolved oxygen, etc., all-solid-state potentiometric microsensors for in situ measurement of heavy metal ions in sediments have been designed. , However, robust microelectrodes are still required to achieve long-term continuous monitoring. Alternatively, gel-integrated sensors and sensors covered with a protective film, including the hydrogel, , SiO x film, and SiO 2 /Si diaphragm, can improve the hydrophilicity of these electrodes and be used for low water content samples. These sensors represent substantial progress toward in situ measurement; however, the adsorption of particulate matter cannot be eliminated, and the presence of these films may reduce the mass-transfer efficiency.…”

mentioning

confidence: 99%

In Situ Continuous Measurement of Salinity in Estuarine and Coastal Sediments by All-Solid Potentiometric Sensors

Liao

Lin

et al. 2023

ACS Sens.

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Salinity is crucial for understanding the environmental and ecological processes in estuarine and coastal sediments. In situ measurements in sediments are scarce due to the low water content and particulate adsorption. Here, a new potentiometric sensor principle is proposed for the real-time in situ measurement of salinity in sediments. The sensor system is based on paper sampling and two all-solid electrodes, a cation-selective electrode (copper hexacyanoferrate, CuHCF) and an anion-selective electrode (Ag/AgCl). The spontaneous aqueous electrolyte extraction and redox reaction can produce a Nernstian response on both electrodes that is directly related to salinity. This potentiometric sensor allows for salinity acquisition in a wide salinity range (1–50 ppt), with high resolution (<1 ppt), and at a low water content (<30%), and it has been applied for the in situ measurement of salinity and the interpretation of cycling processes of metals in estuarine and coastal sediments. Moreover, the sensor coupled to a wireless monitoring system exhibited remote-sensing capability and successfully captured the salinity dynamic processes of the overlying water and pore water during the tidal period. This sensor with its low cost, versatility, and applicability represents a valuable tool to advance the comprehension of salinity and the salinity-driven dissolved-matter variations in estuarine and coastal sediments.

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Fabrication of a low leakage current type impedance sensor to monitor soil water content for slope failure prognostics

Futagawa

Ogasahara

Ito

et al. 2017

2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)

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Fabrication of a hydrophilic property impedance sensor to stably monitor soil water content for slope failure prognostics

Cited by 3 publications

References 22 publications

Enhancing the Understanding of Soil Nitrogen Fate Using a 3D-Electrospray Sensor Roll Casted with a Thin-Layer Hydrogel

Enhancing the Understanding of Soil Nitrogen Fate Using a 3D-Electrospray Sensor Roll Casted with a Thin-Layer Hydrogel

In Situ Continuous Measurement of Salinity in Estuarine and Coastal Sediments by All-Solid Potentiometric Sensors

Fabrication of a low leakage current type impedance sensor to monitor soil water content for slope failure prognostics

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