| abstract |
(57) [Abstract] (Correction) [Problem] To suppress the occurrence of pigment precipitation and to determine the concentration of an oxidant, particularly the residual chlorine concentration, in a test solution even after a lapse of time after color development. A method for determining the amount of residual chlorine that can be produced, a kit for determining the amount of residual chlorine, and a kit for detecting an oxidant. SOLUTION: According to the hue of a dye produced by mixing a solution containing a benzidine indicator 2 or a salt thereof and a test solution, Method for determining the amount of residual chlorine in the test liquid. In the method for determining the residual chlorine amount in a test solution by the hue of a dye produced by mixing a solution containing a benzidine indicator 2 or a salt thereof with a test solution, changing the concentration of the benzidine indicator or its salt A method for determining the amount of residual chlorine that changes the concentration range of residual chlorine that causes a change in the hue of the produced dye. |