Provided is a device (100, 200, 300) used for removing inorganic carbon, comprising: a first space (101, 201, 301), used for receiving a first water flow (102, 202, 302) containing inorganic carbon of a first concentration, and for providing carbon dioxide (103, 203, 303) converted from said inorganic carbon, and an analysis flow (104, 204, 304) containing inorganic carbon of a second concentration, said second concentration being lower than said first concentration; and a second space (105, 205, 305), used for receiving a second water flow (106, 206, 306) and absorbing the carbon dioxide (103, 203, 303) coming from said first space (101, 201, 301). Also disclosed are a method used for removing inorganic carbon, and an apparatus and method used for detecting total organic carbon.
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