In the determination of ammonia concentration in a sample gas, trapping NH4+ ions using a sulfuric acid trap is popular. However, I was not certain if there is a method to measure the concentration of NH3 or NH4+ through titration? I am trying a way around using an ion chromatography system.
Ammonia in there ammonium form can be easily complexed with Nessler reagent and determine using spectrophotometer. This is classsical and very robust method which we extensively uses to determine ammonia in various sample pharmacetuical raw materials upto trace level.
After ammonia is quantitatively absorbed from gas/vapour in a known excess of standard strong mineral acid aq. sol., you may then back-titrate the excess of acid with strong base aq. sol., to find the stoichiometric amount of acid previously consumed by the previously absorbed ammonia.
On predicting the pH of a pure (NH4)2SO4 aq. sol.; see: https://www.researchgate.net/post/What-is-the-difference-between-using-ammonium-sulfate-and-using-sodium-sulphate-in-protein-ppt-and-seperation
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