| 摘要 |
PURPOSE: To prevent the purity deterioration of treated water, the danger of a measurement error due to contamination, and the increase in control costs of an ion exchange apparatus by measuring the boron concentration in water which passed through the ion exchange apparatus and judging the break of the apparatus. CONSTITUTION: Water to be treated by a mixed bed type ion exchange apparatus 1 is pretreated to have high purity by a pretreatment apparatus 2, the first stage reverse osmosis membrane 3, and the second stage reverse osmosis membrane 4. Part of water treated by a mixed bed type ion exchange apparatus 1 is taken out through a sampling cock 5; the concentrations of boron and silica are measured, and the specific resistance of the treated water is detected by a specific resistance cell 6 and a specific resistance meter 7. In this way, the purity deterioration of the treated water due to boron which leaks out first from an anion exchange resin can be prevented. The determination of low concentration of boron in water is simple in an analytical procedure as compared with that of low concentration of silica so that the danger of a measurement error can be prevented. |
