A low-cost in-situ CO2 sensor based on a membrane and NDIR for long-term measurement in seawater

Li, Meng; Du, Baolu; Guo, Jinjia; Zhang, Zhihao; Lu, Zeyu; Zheng, Ronger

doi:10.1007/s00343-021-1133-7

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…TDLAS mainly uses the narrow linewidth of the laser and the change in wavelength with the injection current to measure single or several close and indistinguishable spectral lines of molecules [35], [36]. Although the system has high precision and good selectivity with this technical solution, the cost of the laser is relatively high [37], [38], [39], and the total system size is enormous, which is not conducive to miniaturization. In addition, it uses a single-wavelength laser, which detects only one gas and does not allow for multi-component gas detection at the same time [40].…”

Section: Infrared Gas Sensormentioning

confidence: 99%

Greenhouse Gas Detection Based on Infrared Nanophotonic Devices

Hao

Jiang

et al. 2023

IEEE Open J. Nanotechnol.

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Most greenhouse gases come from biological activities and industry which will lead to global warming and show an impact on human life. With the need of green transformation of the global economic structure and seeking for higher quality of human life, the detection and management of greenhouse gases, as well as most hazardous gases in the environment, are increasingly demanding. Applications in different fields require sensors that can detect gas volume fractions with magnitudes from 10-9 to 10-4. Greenhouse gas detection plays an important role both in the agriculture and industry field. In this review, we first summarize the mechanism of several common gas detectors used currently. Then, the advantages of nanostructured gas sensors are discussed. Finally, the applications of infrared gas sensors based on nanophotonic devices are described in detail. This review has been an outlook on the future development of infrared gas sensors based on nanophotonic devices.INDEX TERMS Environment and climate, greenhouse gas, nanostructures, photonic device.

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Section: Infrared Gas Sensormentioning

confidence: 99%

Greenhouse Gas Detection Based on Infrared Nanophotonic Devices

Hao

Jiang

et al. 2023

IEEE Open J. Nanotechnol.

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“…Therefore, it is necessary to improve the membrane in order to reduce the diffusion time and gas leakage. In the recent two decades, many novel sensors for the carbon dioxide measurements have been reported [149][150][151]. For example, Lu et al reported an in situ chemical pCO 2 sensor based on optical fiber for surface seawater (Figure 5b) [143].…”

Section: Sensors For Carbon Dioxide (Co 2 )mentioning

confidence: 99%

A Review of Marine In Situ Sensors and Biosensors

Liu

Cui

2023

JMSE

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The exploration of the ocean is essential for the exploitation of marine resources and the sustainable development of human society. In order to assess both the health and the resources of the marine environment, a variety of chemical and biological sampling is needed. Traditionally, marine samples are collected on site and transported to a laboratory for analysis. Analytical methods are often tedious, and it is difficult to know the in situ real-time status. This review provides a comprehensive summary of the development of in situ chemical and biological sensors for the typical compounds in the ocean, including methane, radon, ferrous ion, carbon dioxide, microorganisms, pollutants, nutrients and seafood. Different types of sensors for each compound are highlighted, such as novel electrochemical and optical sensors. Commercial status of different sensors is introduced, and performance of representative sensors is compared and discussed deeply. The advantages and disadvantages of each sensing technique are analyzed and evaluated in detail. Finally, future prospects and work directions are presented, such as the deployment of these in situ sensors on fixed and/or moving platforms, development of microfluidic sensors and exploration of new antifouling materials and methods. This paper could serve as a resource for developing more advanced in situ chemical sensors and biosensors for marine scientific research, as well as related practical applications for monitoring marine resource exploration and exploitation and for environmental protection.

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“…to allow simultaneous determination of a variety of gases. For example, Li et al (2021) placed a portable CO 2 sensor on a coastal platform over 35 days and found a trend opposite to the local tides. They speculated that besides the temperature-induced changes in CO 2 solubility, tidal-driven SGD processes were likely an additionally significant contributor to the variation of CO 2 concentrations (Wang et al, 2017).…”

Section: Perspectivesmentioning

confidence: 99%

In-situ radon-in-water detection for high resolution submarine groundwater discharge assessment

Zhao

Burnett

et al. 2022

Front. Mar. Sci.

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Submarine groundwater discharge (SGD), including both land-based fresh groundwater that enters the ocean from coastal aquifers as well as recirculated seawater that is continuously recharged and discharged on the seabed, has been considered as an important component of the global water and biogenic element (e.g., nitrogen, phosphorus, silicon and carbon) sources and a significant pathway for material exchange at the land-sea interface of coastal ecosystems. Some researchers reported that SGD associated nutrient additions to coastal waters have caused unwanted ecological issues, including red tides, coastal acidification and hypoxia. Natural radon isotope (222Rn, t1/2 = 3.8 d) is an excellent tracer for studying SGD and other oceanographic processes including air-sea gas exchange, sediment-water diffusion, and earthquake prediction. However, the conventional radon measurement methods suffer many technical disadvantages. We consequently developed a convenient submersible radon determination approach (“OUC-Rn”) using a commercial pulsed ionization chamber (PIC) radon sensor and gas extraction membrane module to produce high precision and high resolution observations. We demonstrate the radon degassing efficiency of the membrane contactor is comparable to the shower-head type air-water exchanger but is independent of operating position. The radon measurement efficiency of the PIC is 2-fold higher than the RAD7 detector and is far less influenced by moisture. We successfully deployed the system in 2.5 meters water depth over a 100 hours period in an anthropogenic influenced bay. Based on our high temporal resolution observations, the SGD flux was estimated to be 0-43.0 cm/d (mean: 25.4 ± 14.5 cm/d). The SGD fluxes pattern plotted together with the tidal variations revealed that tidal pumping may be the main force driving seawater recirculation into aquifers and thus affecting nutrient, carbon and other dissolved matters dynamics in coastal regions.

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A low-cost in-situ CO2 sensor based on a membrane and NDIR for long-term measurement in seawater

Cited by 8 publications

References 32 publications

Greenhouse Gas Detection Based on Infrared Nanophotonic Devices

Greenhouse Gas Detection Based on Infrared Nanophotonic Devices

A Review of Marine In Situ Sensors and Biosensors

In-situ radon-in-water detection for high resolution submarine groundwater discharge assessment

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