Abstract: By analyzing the impact of free chlorine on the detection results of sulfide projects,and comparing the effects of factors such as contact time of fixed agents,use of different reagents,dechlorination time,and different treatment methods on the detection results,the necessity and feasibility of dechlorination for detecting sulfide in chlorine-containing water samples were confirmed,and the method was optimized for more accurate detection of sulfide in water.

Key words: free chlorine, sulfide, dechlorination