The invention discloses a marine carbon dioxide on-line monitoring method and a marine carbon dioxide on-line monitoring device based on electrochemical sensing. The method comprises the following step of : detecting marine carbon dioxide according to the concentration of marine carbonate and the equilibrium relationship of a seawater carbonate system. The device comprises a cabin body, a pH and salinity flow cell, an electrode flow cell, a flow path system and a control system, wherein the pH and salinity flow cell, the electrode flow cell, the flow path system and the control system are arranged in the cabin body; The pH and salinity monitoring assembly is inserted into the pH and salinity flow cell; An electrode assembly is inserted into the electrode flow cell, and the concentration of carbonate ions in the sea is monitored by the electrode assembly; A flow path system for supplying seawater or calibration solution to the pH and salinity flow cell and the electrode flow cell; The control system is used for controlling the flow path system and calculating the marine carbon dioxide. According to the invention, the sample demand is small, the operation is simple, the precision and the stability can meet the monitoring indexes, the long-term stable and accurate monitoring of the data can be ensured, and the system can carry observation platforms such as a buoy submersible buoy, a station, a monitoring ship and the like to carry out long-term marine water body monitoring.
; 廖志博; 江天甲
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