The storage method tetrazolium compound, a tetrazolium compound reagent solution using a stabilizer, and the method used for the same

The tetrazolium compound, provides a method of storing stably. Save tetrazolium compound in a state of coexistence with sodium azide. Addition ratio of the tetrazolium compound and sodium azide (A: B) is 1: 0.02: in the range of 6.2. Also, if stored at a solution state, the concentration of the sodium azide is in the range of 0.08~3.2mmol / L, the concentration of the tetrazolium compound is in the range of 0.5~8mmol / L. As the tetrazolium compound, 2- (4-iodophenyl) -3- (2,4-dinitrophenyl) -5- (2,4-sulfophenyl) -2H- tetrazolium salt is preferable.