Determination of Concentration of Free Carbon Dioxide in Artificial Seawater by Difference Balance System/Henry’s Law

Guang-Hu Liu, Li-Ting Deng, Ming-Ming Wen (), Hao-Nan Cui, Jing-Yi Huang, Chen-Fei Wang, Hang-Yi Zhao, Chu-Ping Wang and Tian-Rui Chen
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Guang-Hu Liu: China Institute of Disaster Prevention, Sanhe 065201, China
Li-Ting Deng: School of Earth Science, Hebei GEO University, Shijiazhuang 050031, China
Ming-Ming Wen: Guangzhou Marine Geological Survey, Guangzhou 510760, China
Hao-Nan Cui: College of Oceanography, Hohai University, Nanjing 210024, China
Jing-Yi Huang: China Institute of Disaster Prevention, Sanhe 065201, China
Chen-Fei Wang: China Institute of Disaster Prevention, Sanhe 065201, China
Hang-Yi Zhao: China Institute of Disaster Prevention, Sanhe 065201, China
Chu-Ping Wang: China Institute of Disaster Prevention, Sanhe 065201, China
Tian-Rui Chen: China Institute of Disaster Prevention, Sanhe 065201, China

Sustainability, 2023, vol. 15, issue 6, 1-14

Abstract: The concentration of dissolved carbon dioxide in seawater affects the formation of seabed biogenic minerals, and controls the development and evolution of marine organisms, which is one of the most important indices in the marine environment and geology survey. The concentration of free carbon dioxide in bottom seawater has important academic value for the exploration of seabed minerals, marine environment monitoring, the study of the carbon cycle in seabed sediments and even the global carbon cycle. Titration is used to determine the index, whose range is between 4 mg/L and 400 mg/L. However, the concentration of free carbon dioxide in bottom seawater in some sea areas is lower than this range, thus titration may not be suitable. A method for the determination of free carbon dioxide in artificial seawater, whose name is D.B.S/Henry’s Law, is described in this paper. D.B.S/Henry’s Law indirectly determines the content of free carbon dioxide in seawater instead of directly titrating with reagents. It is simple, fast and accurate, and it is based on the law of conservation of mass/Henry’s law and CO 2 dissolution mechanisms. This discovery mainly provides a new scientific perspective for the determination of trace free carbon dioxide concentration in seawater. In addition, Henry’s law constants of carbon dioxide in artificial seawater at 3–20 degrees Celsius are determined with D.B.S/Henry’s Law. These data will be used as an important reference for the determination of free carbon dioxide in seawater in the future. D.B.S/Henry’s Law may be used as a supplement of the methods specified in national and industrial standards, which are applied to the detection of carbon dioxide Henry’s constant and free carbon dioxide content in various temperature and salinity seawater. D.B.S/Henry’s Law provides a new perspective for CO 2 determination and has extensive practical application value.

Keywords: seawater; free carbon dioxide; D.B.S/Henry’s Law; Henry’s law constant; industrial standards (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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