Detection method of nitrogen trichloride in bromine plant

The redox reaction between sodium sulfite and nitrogen trichloride is used. Nitrogen trichloride is reduced to ammonium ion (NH4+) and dissolved in water, and then ammonia (NH3) is evaporated in alkaline medium, absorbed by standard acid, and detected by the reduction reaction of alkali back drop. Nitrogen chloride, also known as trichloroamine, is an inorganic compound with the chemical formula NCl3. It is a yellow, oily and pungent volatile toxic liquid with a boiling point of 7 1 degree, which is extremely unstable.