| 摘要 |
PROBLEM TO BE SOLVED: To provide a residual chlorine measuring device by polarography and a residual chlorine measuring method that realize acquisition of free residual chlorine concentration and combined residual chlorine concentration upon distinguishing between them, without using an agent.SOLUTION: A first oxidation-reduction current I(V) is obtained by applying a first applied voltage Vto be selected from a range from +100 to -50 mV to a part between a gold detection electrode and a silver/silver-chloride counter electrode, a second oxidation-reduction current I(V) is obtained by applying a second applied voltage Vto be selected from a range from -150 to -250 mV to a part between the detection electrode and the counter electrode, free residual chlorine concentration Nf is obtained from the first oxidation-reduction current I(V), a current Ic(V) based on combined residual chlorine concentration Nc is obtained by subtracting a current If(V) based on the free residual chlorine concentration Nf from the second oxidation-reduction current I(V), and then the combined residual chlorine concentration Nc is obtained from the current Ic(V). |
