(JP6108020) PROBLEM TO BE SOLVED: Being the sample water which includes the ammonia of high density, it offers the ion exchange equipment whose it is possible to remove the cation sufficiently, and the anion detection device which can detect the anion securely. SOLUTION: It had valve V13 and valve the cathode room 16 where the anode room 15 where the suffering processing liquid flows flows out and the water flows flows out and the aforementioned anode room the anode and are arranged in the aforementioned cathode room 16 the cathode and the aforementioned anode room the pressure of the cation exchange body and the aforementioned anode room 15 which fill up to the both of 15 which are arranged in the cation exchange membrane 40 which divides 15 and the cathode room 16 and the aforementioned anode room 15 and the aforementioned cathode room 16 as the pressure adjustment expedient which is made higher than pressure of the aforementioned cathode room 16 V15, in the ion exchange equipment and this ion exchange equipmentThe anion detection device which combines electric conductivity total 70.
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