Real-time analysis of multicomponent dissolved inorganic carbon in the air-sea exchanging process using gas-liquid Raman spectroscopy. Issue 4 (August 2021)

• Record Type: Journal Article
• Authors: Guo, Jinjia; Wang, Yongmei; Luo, Zhao; Zhang, Feng; Yang, Dewang
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 4(2021)
• Publication Date: 2021-08
• Subjects: Gas-liquid Raman spectroscopy -- Real-time analysis -- Multicomponent dissolved inorganic carbon -- Air-sea exchange; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105785
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Carbon cycle in coastal water is a significant dynamic component of global carbon budget, however, the diverse sources, carbon sinks and their complex interactions remained poorly understood. In order to detect the dissolved inorganic carbon (DIC) and their interactions, gas-liquid Raman spectroscopy was built and applied to simultaneously detect the constituents of air, dissolved CO2, HCO3 - and chlorophyll in coastal water. The linear fitting curve between peak intensity and concentration was built for the quantitative analysis of HCO3 - and CO2, meanwhile, the fluorescence peaks of chlorophyll at 679 nm were detected for the qualitative analysis. For the multi-components analysis, typical Raman spectra of the constituents of air, dissolved CO2, HCO3 - in seawater, and the fluorescence spectra of chlorophyll in seawater were detected. Results showed that the time dependent change of CO2 and O2 in the air exhibited a contrary tendency, while that of dissolved CO2 and O2 was curved like a cosine. The changing tendency of relative concentrations of dissolved CO2 was about 2 h earlier than CO2 in air, due to the life activity of microorganisms driving the gas exchange at the air-sea interface. Furthermore, the study makes a study on the relationship between DIC and chlorophyll based on the detection of HCO3 - and chlorophyll in coastal water, indicating that this gas-liquid Raman spectroscopy could successfully provide real-time analysis of multicomponent DIC in the air-sea exchanging process. Graphical Abstract: ga1 Highlights: Gas-liquid Raman spectroscopy was developed for simultaneous detection of multiple components. Qualitative and quantitative approaches of HCO3 -, CO2, and chlorophyll were developed. Change tendency of CO2 and O2 in the air and seawater was revealed. Detection of HCO3 - and chlorophyll was to reveal the mechanisms of DIC changes in the air-sea exchanging process.