| 摘要 |
PROBLEM TO BE SOLVED: To adjust the pH of a sample water to a prescribed value or lower without having to add acid such as phosphoric acid in a TOC meter (Total Organic Carbon measuring apparatus) of a system for determining the concentration organic matter in a sample water by measuring changes in the electric conductivity of a test water acquired by oxidatively decomposing organic matter in the sample water, converting it into carbon dioxide, and transferring carbon dioxide from the sample water. SOLUTION: The TOC meter is provided with a pH adjusting part in which a channel through which an acid pH adjusting solution containing anions flows and a channel through which a sample water flows are in contact with each other via an ion-exchange film. The pH adjusting part is provided with electrodes for applying a voltage between both channels and adjusts the pH of the sample water by applying a voltage between both channels in such a way as to constitute the side of the channel through which the acid pH adjusting solution flows as a positive electrode and the side of the channel through which the sample water flows as a negative electrode and making anions migrate to the sample water from the pH adjusting solution. The TOC meter is configured such that the sample water may be sequentially introduced to an IC removal part, an oxidative decomposition part, and a carbon dioxide extraction part after passing though the pH adjusting part. COPYRIGHT: (C)2010,JPO&INPIT
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