| 摘要 |
PURPOSE:To prevent the erosion of a measuring electrode with bromine even if exhaust gas containing the bromine is measured by providing a bromine-ion trap at the middle of a path for guiding absorbing liquid to the measuring electrode. CONSTITUTION:Gas to be measured is absorbed into absorbing liquid in an absorbing pipe 13. Then the liquid is guided into a bromine-ion trap 21 through a five-way cock 15. Thereafter, the liquid is guided into a second cell chamber 2 through a heat exchanger 20. The bromine trap 21 is filled with the specified amount of granules of AgCl. The gas to be measured is absorbed into the absorbing liquid, and HCl in exhaust gas is detected as the concentration of chlorine ions. When the bromine ions are contained in the absorbing liquid in this constitution, reaction shown by the expression in the figure is generated. AgBr substitutes for AgCl, and the concentration of chlorine ions is increased by that amount. Since the AgCl is used as the bromine trap, a measuring elec trode 6 is not eroded with the bromine ions, and the sensitivity for the chlorine ions can be maintained. |
