Ejection reaction system for detecting sulfide in water

The utility model provides an eviction reaction system for detecting sulfide in water quality, which comprises an eviction pool and a reaction pool, a water sample is injected into the eviction pool, a certain amount of annularly placed phosphoric acid is communicated with the inlet end of the eviction pool, after the phosphoric acid is introduced into the eviction pool and the water sample is acidified, the sulfide is converted into hydrogen sulfide, and the hydrogen sulfide is blown out by nitrogen and then is introduced out from the upper end of the eviction pool; hydrogen sulfide enters from the lower end of the reaction tank after passing through the pipeline; the position of the reaction tank is lower than the lowest part of the expelling tank, quantitative absorption liquid is arranged in the reaction tank, quantitative color developing liquid is added into the reaction tank absorbing hydrogen sulfide for reaction, the absorbance of the liquid after reaction is tested, the reaction tank is a special-sh