The Spectrophotometric Determination of Ammonia by Chromotropic Acid; Application to Nitrogen Analysis in Steel

Abstract

Ammonia is converted to copper ammine complex ion when it is absorbed into cupric chloride solution. Then, by adding chromotropic acid solution into this complex ion, the color of absorbing solution changes into purplish red.The spectrophotometric determinations were made on ammnonia by making use of that its maximum absorption wavelength is 520 nm.It was also tested the absorption spectrum, adding amount and stability of reagents and heating time etc.On the basis of results obtained, this method was applied to determine nitrogen in steel. By using standard sample, experimental values were found to agreed well with the standard ones.