Rapid and real-time analysis of multi-component dissolved gas in seawater by Raman spectroscopy combined with continuous gas-liquid separator

doi:10.1016/j.cjche.2024.04.020

中国化学工程学报 ›› 2024, Vol. 73 ›› Issue (9): 146-153.DOI: 10.1016/j.cjche.2024.04.020

Rapid and real-time analysis of multi-component dissolved gas in seawater by Raman spectroscopy combined with continuous gas-liquid separator

Dewang Yang¹, Wenhua Li¹, Lei Guo², Yuhang Ji³, Yanzhe Gong¹, Junwei Chu², Libin Du¹, Yongmei Wang^3,4

1. College of Ocean Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2. Xi'an Institute of Applied Optics, Xi'an 710065, China;
3. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
4. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China

收稿日期:2023-12-12 修回日期:2024-04-07 接受日期:2024-04-25 出版日期:2024-11-21 发布日期:2024-05-25
通讯作者: Yongmei Wang,E-mail:yongmeiwang2011@163.com
基金资助:
The authors thank the National Natural Science Foundation of China (52304236) and the Natural Science Foundation of Shandong Province (ZR2021QE076) for the financial support to this research extracted from the project.

Rapid and real-time analysis of multi-component dissolved gas in seawater by Raman spectroscopy combined with continuous gas-liquid separator

Dewang Yang¹, Wenhua Li¹, Lei Guo², Yuhang Ji³, Yanzhe Gong¹, Junwei Chu², Libin Du¹, Yongmei Wang^3,4

1. College of Ocean Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
2. Xi'an Institute of Applied Optics, Xi'an 710065, China;
3. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
4. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China

Received:2023-12-12 Revised:2024-04-07 Accepted:2024-04-25 Online:2024-11-21 Published:2024-05-25
Contact: Yongmei Wang,E-mail:yongmeiwang2011@163.com
Supported by:
The authors thank the National Natural Science Foundation of China (52304236) and the Natural Science Foundation of Shandong Province (ZR2021QE076) for the financial support to this research extracted from the project.

摘要/Abstract

摘要： Rapid and sensitive detection of dissolved gases in seawater is quite essential for the investigation of the global carbon cycle. Large quantities of in situ optical detection techniques showed restricted measurement efficiency, owing to the single gas sensor without the identification ability of multiple gases. In this work, a novel gas-liquid Raman detection method of monitoring the multi-component dissolved gases was proposed based on a continuous gas-liquid separator under a large difference of partial pressure. The limit of detection (LOD) of the gas Raman spectrometer could arrive at about 14 μl·L^-1 for N₂ gas. Moreover, based on the continuous gas-liquid separation process, the detection time of the dissolved gases could be largely decreased to about 200 s compared with that of the traditional detection method (30 min). Effect of equilibrium time on gas-liquid separation process indicated that the extracted efficiency and decay time of these dissolved gases was CO₂ >O₂ >N₂. In addition, the analysis of the relationship between equilibrium time and flow speed indicated that the decay time decreased with the increase of the flow speed. The validation and application of the developed system presented its great potential for studying the components and spatiotemporal distribution of dissolved gases in seawater.

关键词: Dissolved gas, Rapid quantitative analysis, Gas-liquid separator, Gas-liquid Raman spectroscopy

Abstract: Rapid and sensitive detection of dissolved gases in seawater is quite essential for the investigation of the global carbon cycle. Large quantities of in situ optical detection techniques showed restricted measurement efficiency, owing to the single gas sensor without the identification ability of multiple gases. In this work, a novel gas-liquid Raman detection method of monitoring the multi-component dissolved gases was proposed based on a continuous gas-liquid separator under a large difference of partial pressure. The limit of detection (LOD) of the gas Raman spectrometer could arrive at about 14 μl·L^-1 for N₂ gas. Moreover, based on the continuous gas-liquid separation process, the detection time of the dissolved gases could be largely decreased to about 200 s compared with that of the traditional detection method (30 min). Effect of equilibrium time on gas-liquid separation process indicated that the extracted efficiency and decay time of these dissolved gases was CO₂ >O₂ >N₂. In addition, the analysis of the relationship between equilibrium time and flow speed indicated that the decay time decreased with the increase of the flow speed. The validation and application of the developed system presented its great potential for studying the components and spatiotemporal distribution of dissolved gases in seawater.

Key words: Dissolved gas, Rapid quantitative analysis, Gas-liquid separator, Gas-liquid Raman spectroscopy

Dewang Yang, Wenhua Li, Lei Guo, Yuhang Ji, Yanzhe Gong, Junwei Chu, Libin Du, Yongmei Wang. Rapid and real-time analysis of multi-component dissolved gas in seawater by Raman spectroscopy combined with continuous gas-liquid separator[J]. 中国化学工程学报, 2024, 73(9): 146-153.

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Rapid and real-time analysis of multi-component dissolved gas in seawater by Raman spectroscopy combined with continuous gas-liquid separator

Rapid and real-time analysis of multi-component dissolved gas in seawater by Raman spectroscopy combined with continuous gas-liquid separator

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