RESIDUAL CHLORINE MEASUREMENT DEVICE AND RESIDUAL CHLORINE MEASUREMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a residual chlorine measurement device and residual chlorine measurement method using a polarography allowing the total residual chlorine concentration of water containing a benzotriazol group to be determined.SOLUTION: After a preprocessing step A including a step A1 of applying applied voltage V=-1 V for one second, a step A2 of applying applied voltage V=1 V for one second, and a step A3 of applying applied voltage V=-1 V for one second, a step B1 of applying applied voltage V=1 V for 0.5 second, a step B2 of applying applied voltage V=-1 V for 0.2 second, and a step B3 of applying applied voltage V=0 V for 0.5 second are performed. The oxidation-reduction current obtained immediately before the completion of the step B3 is measured, and the total residual chlorine concentration is determined.SELECTED DRAWING: Figure 2