The Determination of Henry’s Law Constant of Carbon Dioxide in Stratified Seawater of the South China Sea's Shenhu Sea by D-value of Multi Balance Systems

LIU Guang-hu; DENG Li-ting; SHANG He-hui; CUI Hao-nan; GUAN Cheng-yao; JI Xu-meng; LIU Xiao-yan; HAN Ruo-bing

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LIU Guang-hu，DENG Li-ting，SHANG He-hui, et al. The Determination of Henry’s Law Constant of Carbon Dioxide in Stratified Seawater of the South China Sea's Shenhu Sea by D-value of Multi Balance Systems[J]. Haiyang Xuebao，2025, 47(x)：1–11

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The Determination of Henry’s Law Constant of Carbon Dioxide in Stratified Seawater of the South China Sea's Shenhu Sea by D-value of Multi Balance Systems

1.
China Institute of Disaster Prevention, Sanhe, Hebei 065201, China
2.
Hebei Key Laboratory of Earthquake Dynamics, Sanhe, Hebei 065201, China
3.
Core and Samples Center of Nature Resources of China Geological Survey, Sanhe, Hebei 065201, China
4.
Guangzhou Marine Geological Survey, Guangzhou, Guangdong, 511458
5.
Guangzhou Huali College, Jiangmen Guangdong 529152, China

Received Date: 2025-01-21
Rev Recd Date: 2025-03-24

Available Online: 2025-05-26

Abstract

Abstract

The concentration of dissolved carbon dioxide in seawater affects global climate change, the growth of marine organisms and controls the formation of submarine carbonates, it is one of the most important indices in the marine environment and mineral resource survey. It has important academic value for the exploration of seabed minerals, monitoring of marine environment, the study of carbon cycle in seabed sediments and even the global carbon cycle. Titration and Henrys are used to determine the concentration of dissolved carbon dioxide in seawater. The Henrys is more suitable for seawater, especially for a great deal of seawater samples collected from the same sea area on board ships, the results are mainly based on the theoretical Henry's constant of carbon dioxide in seawater, in fact, the Henry’s Law Constants of carbon dioxide in different seawater are different. In order to achieve higher measurement accuracy and precision, the Henry’s Law Constants of carbon dioxide in seawater have to be determined first. An experimental plan is designed and D-value of Multi Balance Systems is put forward in this article, which is used to determine the Henry’s Law Constants of carbon dioxide in seawater. D-value of Multi Balance Systems is based on the principle of mass conservation and the dissolution behavior of carbon dioxide in seawater. In D-value of Multi Balance Systems, multiple gas-liquid balance systems with different masses and volumes are constructed in advance, then the Henry’s Law Constant of carbon dioxide is derived on the basis of the different mass of carbon dioxide between the balance systems. The Henry's values of carbon dioxide in 24 stratified seawater samples from the South China Sea's Shenhu Sea are determined by D-value of Multi Balance Systems. At last the scientificalness and feasibility of D-value of Multi Balance Systems are proved by multiple system conversion coincidence experiments.

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References

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