Objectives To establish a method of TMB residual chlorine rapid test kit which can be used in spot determination on residual chlorine for swimming pool water and drinking water from water plants, uses' taps and secondary water supply after chlorination disinfection.

Methods To determine residual chlorine in water by detecting quinone compounds generated through chlorine reacted with TMB in acidic solution.① Different experiments had been done to look for suitable pH of whole system and time of total residual chlorine examination. ② Different concentration of the standard comparison series could be determined. ③ Special glass could be chosen.

Results ① The phenomenon that whole system could turn into green can be avoided when pH is 1.52 and 11 mins is the suitable time for total residual chlorine examination. ② Concentrations of standard color series for the test kit could be 0.05、0.1、0.2、0.3、0.5、0.7、0.8、1.0 mg/L. ③ Borosilicate glass had been chosen to make the standard series and comparison tubes in according to the requirements of anti-explosion and high light transmission.

Conclusions TMB residual chlorine rapid test kit can meet the requirement for daily determination on residual chlorine.