| 摘要 |
<p>PURPOSE:To continuously perform highly accurate measurement undergoing little error, by immersing one end of an aeration column in specimen water to make the immersion ratio thereof constant. CONSTITUTION:An aeration column 1 and a measuring column 2 are integrally constituted and demarcated by a partition wall 3. Dissolved oxygen (DO) meters 5, 6 are provided to the measuring column 2 and floats 7 are mounted to the arbitrary positions of the integrally formed columns 1, 2. Since the columns 1, 2 are floating in an aeration tank by the floats 7, the immersion ratio of the column 1 becomes constant even when a water level varies. Further, since the capacity of an air lift pump 8 is determined by an air flow rate and the immersion ratio, by properly selecting the air flow rate and the immersion ratio, water pumping-up amount is determined. The specimen water pumped up by this method passes through the DO meters 5, 6 to measure the DO value of the specimen water. The difference between the measured values of the DO meters 5, 6 is divided by a passing time to make it possible to measure an oxygen utilizing speed.</p> |
